S.B.
You need to find financial and emotional support for yourself. First is he financially supporting his child? He should be. Is his name on the birth certificate? if it is, he could sue for custody or visitation in the future if you don't take care of the legal situation. Just be aware.
there are wonderful programs for single parents. There's a great group called Parents without Partners that arranges activities for single parents. Churches often have singles programs - if you don't have single men your age at your church - would you consider attending programs at other churchs? go to mom and baby classes - gymboree, infant massage etc - find listings online, at the church, at local hospitals.
I'm not a single mom but two of my best friends are - you are going to have tons of replies soon and everyone will tell you that being a single mom is hard but not impossible. Your daughter will grow up loved and well-taken care of and you will make a good life for the two of you. right now you are feeling overwhelmed and lost - that's natural. But do what you need to do to protect the two of you legally and emotionally and you will be fine.