Unexpected pregnancy.

I wasn't planning on conceiving a baby and used this app just to track my period, but I realized I was reaaaallly late and took a pregnancy test, of course it came out positive. When I told the father, he said it was all my fault and he wants nothing to do with the baby, me, nor contribute any type of income. This is my first pregnancy and I'm 21. I'm really scared and I've decided to keep the baby. It's just making me nervous for my child that he or she won't have a father figure around and it makes me feel sad for my baby. But on the other hand I'm a good person and I know that I can be a good mom. I just wanted some opinions.