Relationship trouble.

I feel trapped in my relationship. I'm not happy & don't know what to do. I feel guilty if I leave my boyfriend. He doesn't show me any affection though. I'm 17 and he is 19. He rushed me to get ready for prom because his mom was throwing a fit because I had to fix my hair. Apparently I take to long but showed up on time. She doesn't act like she likes me and is a control freak to her son which is my current boyfriend. After getting there & taking four hours to get completely ready, he never Once told me I looked beautiful.:( He constantly talks about wanting a kid to pass his family name but hasn't spent any time with me in over a month besides prom. I don't want children. Not until I am 25 & finished college. He only kissed me 2 times prom night & has only held my hand 2 times in over a month. He didn't even really ask me to be his gf. I went to bed after the first prom we went to which was mine & I woke up & it said I was in a relationship with him. He told me his mom said it'd be wierd for us to go to each others proms but not be in a relationship. Everytime we have a disagreement, his sister which is in her mid 20's wants to be involved, personally writes me on fb and it's always my fault it seems like. I feel like my feelings don't matter..... the list goes on. Any advice?