Forums are very helpful with advice, but realize if you marry him, it does bring legal implications such as being financially responsible for bills. Marriage is a serious decision, sit down and talk out what each of you expect from the marriage. Divorce can be expensive, and a long process. Please sit down with your parents and ask them for their views on the why are they are doing this. Then the attorney will be able to show you what your legal options are.
Having a baby with a boyfriend who doesn't even financially support you is an even more serious decision than marriage and brings a host of legal implications beyond marriage. I suspect that's what OP's parents are worried about.