Your parents are worried about you. After all, you are an only child and they are trying to look out for you. YOu have to understand that he may not just have you in his life. There may be more. I know you hang out with him but the trust thing is a big issue.
My advice is to take every day slow and when the time is right and you and him have become more intimatily involved, then talk to them . Tell them everything. they sound like they just want whats bests for you! Sorry if I have lame advice. I have no idea what's going on with my life
LOL
Jane