Okay--I'll apologize now for the NON-LEGAL nature of the following advice.
PLEASE talk to a counselor about this!
If you think that giving your child to someone else to raise and walking away is EASY, and isn't "taking responsibility" or whatever else, you REALLY have no clue about adoption. The attitude of "you made your bed, now lie on it" meaning that you have to KEEP the child is completely wrong--and VERY selfish. Frankly, I see young women who do NOT explore all of their options to be JUST as selfish and "like this" as the men whose first reaction is to not want to parent at this point in their life. Why is it okay for YOU to decide that HE is ready to be a parent when you haven't even examined whether it is in your CHILD'S best interest that YOU should be a parent right now?'
Every woman has to make her own choice in a situation like this, but frankly it drives me crazy that most of them don't actually do any research on the subject of what is best for their child before deciding that being a single parent with a reluctant father who will probably do everything he can to get out of child support and mental/emotional support of the child--which means that yet another kid is scarred by an absent parent.
You're being JUST as selfish as the father at this point if you don't even LOOK into all of your options. His selfishness is putting himself before the needs of a child because he does not WANT to be a parent. YOUR selfishness is putting yourself before the needs of your child because you DO want to be a parent.
In the end, it's your choice, and you have to live with your choice. But don't completely demean him for being selfish about his wishes regarding the child before really examining your own reasons for choosing to parent, and whether you were thinking about YOURSELF first, or the CHILD first when you made that choice.