Listen, you may feel you're are going through a crisis, but keep in mind things do change, things do improve.

Now, I see a pattern in your post. I see you're being denied of the things you want to have: your mother's love, your partner's love, your degree, your happiness.

Why? Is not because of external circumstances. No. Everything comes from within. Whatever is happening on your inner world photocopies in your physical reality.

"People don't take me seriously. I want to change this but I'm forgetting everything I've learned. "

My best guess is that you're feeling unworthy yourself. And you're not. Justy because you're alive, just because you're part of this creation, just because you have a Divine being inside of you, you're unique and worthy. 

I understand things may look bad now, but yes, you can save it. Not only can you save it, you can create new and better opportunities for yourself. Nothing is too hard for your Inner Self. have a little faith in your powers to control reality.

You can start by doing self-love meditations. You now, Buddist monks say the secret to life is saying "YES" to whatever comes. it sounds hard, but it just means to accept whatever comes your way just as it is, because you can change it. 

Or, as Abraham Hicks says, "You need to stop giving a **** about the **** that makes you feel like ****"

In a practical way, here's what I suggest:

"She constantly tells me I'm worthless, nobody will ever love me, etc. she says even worse things about my friends and about my boyfriend. I haven't told him these things. "

This is the script you have gave your mother. She's there to remind you of what you think of yourself. You will need to cleanse this limiting belief you have of being unworthy, and you can try a couple of things:

You could try letting go meditations, like this one: 
https://www.youtube.com/watch?v=xWDRMp35TvI

You could try listening to subliminal like this every day:
https://www.youtube.com/watch?v=xrq4ve4wCOE

Or you could try EFT (Emotional Freedom Tapping). These are conversations you have with yourself while you tap energetic centers in your body. Check this channel and follow one per day: 
https://www.youtube.com/user/eftwizard/videos

Now, about the script
Consider yourself as the director of your life. Your life is your movie, and everyone in it are following a script.
Follow this meditation:
Imagine yourself in a big, beautiful theater. The theater has no roof, and you can look at the stars, the moon, and the clouds when you look up.
You're at the center of the stage, and you're looking at all the beautiful souls that are a part of your life. Souls are loving and kind, and everyone you encounter that is mean to you is just confused by your own thoughts that are pushing them away.
Now, in the center of the stage, imagine yourself greeting all of the important people in your life. Look at them. Could be your mother, your father, your brothers, your friends, your lover,...
Thank them for the role they've had so far, thank them for all the love they've given, and thank them for all the expansion they've caused in you.
Now, try this only with your mother.
Bring your mother forward, and say to her: "I now take responsibility for the role you're going to play in my life. I now want you to deliver the unlovely script I've given you"
See your mother giving you the script she currently has. And old, rugged, ugly fold of papers. Throw it into the sky and see as it vanishes in the night.
Next, give your mother whatever script you want to give her. "Now you will play the role of the loving, supporting mother I've always wanted"
And see yourself giving your mother a new, beautiful script. Next, hug her, kiss her, and say thanks. End your meditation.
Do it with full conviction that you're changing your reality. Do it with your heart full of love and joy. 

II

In the meantime, start forgiving yourself for the negative thoughts you hold inside of you, and forgive others for making you feel bad, especially your mother. The ho'ponomono prayer is a great way to forgive. This is a Hawaiian prayer// meditation where you say "I love you...I'm sorry....please forgive me...thank you" while holding in mind whatever makes you feel bad. It will not only help you forget, it will also help you dissolve those thoughts that brought forward that manifestation.



Soon, you will realize that your happiness only comes from within. You should condition your happiness to the behavior of others, okay? 



Hope it helps

Happy to help! And yes, what is most important is that it resonates with you

You can do all kinds of scripts meditations, just imagine yourself taking the unlovely script out and either giving them a new one of letting them free.

For example, for your lover, you can place yourself in front of him and say, with unconditional love

"I love you and forgive you unconditionally. No matter what you do, I want you to know that I love now. No matter if you're behaving as I'd like, I want you to know that you're safe in my heart and in my soul. I'm sorry for the unlovely script I gave you and for the thoughts I have that pushed you away. I now rescind of that script and take responsibility of the role you'll take on my life"

This one you can do any time you feel a little down. it will fill your heart with joy. As I said before, do it with happiness, playfulness, joy, and with the complete confidence that what you think will change your reality.