Firstly congratulations graduating - well done you, you should be proud of yourself. You are obviously not lazy otherwise you wouldn't have achieved a degree. What are your plans for your future career now that you've graduated?
It sounds like you need to think about getting another job to go alongside your job with McDonalds while you think about your future. In the meantime you could claim Universal Credit to top up your current income & then be in a position to help your mum financially - even if it's only £20 a week, it would help her.
I'm sorry if it sounds patronising, and please be assured that I don't intend it that way, but you & your BF are very young. It's highly likely that you will find that this relationship isn't working & that you will have several others before you meet the right person to spend your life with. Very few people stay with the same person who they met in their late teens/early twenties, though, I acknowledge some do.
If you were my GD (I have 7 GC, the oldest is 15) I would be advising you to concentrate on yourself and your future. By all means continue your relationship with BF, but please be aware that he doesn't seem to be going anywhere career-wise, whereas you have the potential to go very far.
I hasten to say that I'm not at all suggesting that your BF isn't as intelligent as you just because he chose not to go to Uni. My DH doesn't have a degree but ran a very successful business. I have a Masters & am currently working on my PhD. 3 out of our 4 of our children are graduates.
I suspect that your BF is jealous of you and of your achievements & is seeking to bring you down. Don't let him.
Good luck to you - follow your dreams & don't let anyone drag you away from them.
PS - it helps people to read something if you use paragraphs, but I'm sure you've been told that. 😉