Background:

I'm a 18 year old teenager who has always been fat and without social skills. I grew up as a fatty boy who loved to stay on the Internet 24/7 and hated every social interaction. Also my mental health suffered when my father died when I was 15. However, when I was 16 I started to improve and invest on myself after overcoming a depression: I started to run and I discovered that I loved the sport, I lost 90 lbs on summer, I started to read and study harder than ever and I started to force myself into being more social. As a result, with 17, I was one of the best 500 students in my country due to getting the best grades possible (Because my hard work) and every girl in my school thought I was hot as fuck. I also made a lot of friends and overall it as a good year.

However I still had one more task. I liked this girl in my class. I liked her because she wanted to study the same as me. She was not as good looking as other girls who (let's be honest) I could have got, but I thought she was pretty nonetheless. I waited and flirted with her 5 months until we started out. On the beginning it was great, she was kind, down to earth and she treated me well.

Nowadays:

As we both wanted to study the same degree we both thought we could get into the same university. However, she got accepted in my desired college and I was not - she passed the opportunity and came with me to my college. We are currently living "together" - we are in a dorm, and she is in the room next to me. We study in the same class too. We are 24/7 together and I cannot cope with it anymore.

She is turning into a crazy chick. She cries for nearly everything. She is a bit overweight and her selfsteem is not really high due to this, so she has fear that someone else might take me. She doesn't like if I talk to any female friend. Hell, she doesn't even like that I go and get some beers with my friends because she doesn't have friends of her own (And I can understand why, I really can. She is so bad mannered, she will protest for EVERYTHING and complain about everything too. She seems like a drama girl). Today we are in our local town and she got really angry because I was listening to spotify on my house while she wanted me to come to hers to greet her after an entire party night. She wants me to be her bitch every single minute of the day.

We have a date today and I think that she will ask me for more commitment into our relationship and honestly I can't. I'm feeling worse every day, I'm sick of her actitude and this is reflecting into my grades, as I'm failing this college classes. She doesn't let me study but when she studies I annoy her. Hell, we only fuck whenever she wants. If I propose, it's "please, XXXX, not again" but when she proposes, we MUST. Oh, and I have to initiate every day. Oh, and she won't blow me even though I eat her out every single time she asks. Which, honestly, it's not that big deal, but this reflects her attitude.

She is like a dog in the manger. She complains she is fat but she will keep not doing anything. I'm training for a half marathon and motivate her to come with me but she complains that 'running is more important than me' and cry because I go. I think she does this because it is my first relationship ever (I lost my vcard to her, we have been for over a year)

What can/should do, trp. I want to improve on myself just like when I was 17 and be able to be happy again (Honestly, I'm having very very bad thoughts about my whole life) and pass this college class.

TL;DR: My life is falling to pieces in every single thing and I don't know what to do. Sorry for throwaway and for my broken english - I'm just a teenager english student. Thanks for reading, have a nice day.