Help with ual abuse . ( I'm a , 18 , abusive relationship , don't know what to do , distressed )?

my names Sophi. I have had a girlfriend ( not saying her name ) for a whole year now , Long story cut short.. she used to be so nice to me , caring , well mannered towards me and care about how i feel and RESPECT me. now she does not respect me at all or what i want. Over the last 2months we have opened up to each other about how we are physically attracted to each other, not just emotionally ,She suggested we talk about ual things and so on.. fair enough.. i felt comfortable at first with her , the was amazing. Now the is very bad. she doesn't ask me if i want it orhow it feels, does it hurt , she doesn't hold my hand , and she has recently forced me into all different positions. This week has been the worst of the few weeks ive been recieving her attitude but now , i cant take it, i spoke to her and she said sorry and i love you. Late last night i was sleeping in her house and she woke me up by putting her two fingers in me , because i had told her i cannot handle two ( sorry u have to read this part) i woke up and begged her to stop but she would not stop until she got what she wanted, she took my hand and did herself with my hand! last night. i need help, i love her so much , she is still not a monster in my eyes, even though when i read over this , its a monster. i love her. i cant live without her for even a minute, i need her voice and her smile and her kind words, its just this nastiness I need to get rid of. someone please help me get her back to her old self i don't know what to do.