Why are you in such a rush to tie yourself to someone? Do you understand that there is a large part of your life that you are just ending before you even begin.
You don't want to make tons of friends in college and experience being on your own for the first time? You don't want to travel the world and learn from new exciting experiences? You don't want to experience getting your first job and the joy of making your own money, taking care of yourself and growing into a self sufficient woman?
You don't even want to take the opportunity to explore the beauty of the world and everything that it has to offer you?
I'm am terribly sad for you. My years as an adult (from 18-25) are some of the most prized years of my life. I've grown so much and I've truly learned about myself. I don't care what you say, you are stifling your growth by partnering with someone (especially a man with kids) so early in life.
I think your boyfriend is selfish. He is depriving you of essential life experiences by trying to tie you down so early. What's the rush?