what should I do ?

I was a girl and 19 old. My home locate at the foot of a famous mountain, TaiHang in He Nan province. I have a very big family: father, mother, my younger sister, my twin brothers and I. When I was a child, some guys laughed at me that our family had so many children. From then on, I seldom talk about my family in front of others because I feel ashamed .I know that to have so many children is not my fault, but, what I can do beside I keep silent? I admire my roommate very much, because every times when she talks about her family, there would be a very happy sign on her face. I hope I can have a family like her, but nothing I can do to change my situation. Now, I am a freshman in a collage .A boy fell in love with me, so I became his girlfriend. I told him that don't do something to me that I could imagine of my father. Then he asked me that if I keep a relationship with a boy so early just want to find something so called "father's love", I replied him quickly ?'yes'. I always worried about my marriage in the future, will it like my parents'. If so, I would choose a single life.