I was 20 when my first child was born. I also hadn't finished school and I wasn't married, and the guy I was with was a total jerk--I was considering breaking up with him when I found out I was pregnant. I also had a lot of anger, depression, and fear. Now that I've had another child, I've realized that a lot of that was hormonal (in fact, I knew when I was pregnant with my daughter almost instantly because I became incredibly angry at something really stupid).
I almost had an abortion and then changed my mind at the last minute. I felt like I should, because I was in such a bad situation to bring a child into, but in my heart I really wanted my baby.
A really good friend of mine had just had a baby at 19, in similar circumstances, only she was in love with her boy friend and wanted to marry him, but her family hated him. She lived down the street and I would often go and hang out with her and hold her baby and she would tell me how hard it was to tell her parents and how awfully they reacted. It made me feel so much better and not as alone. Also, holding her sweet little baby was really encouraging. If anything, I wish I could pass that on to you.
I am separate from that same situation by only eight years, and my life has turned out to be not what I thought it would after all. My mom was horrible to tell, but at the time I wasn't living with her, so it was a bit easier. My dad was actually happy for me. He loves children, and they had always wanted another child. I ended up moving back home once my relationship with my boyfriend deteriorated. I had a good birth in the same birthing center my brother was born in. My boyfriend was there, but that was kind of a mistake. I really tried to make an effort to get along with him, since we were having a baby together, but in the end I realized it was better to let that go and be on my own--in so many ways he made everything harder by being a jerk. He is still not involved and doesn't care to be--he got a new girlfriend really fast and they had a baby together and he did the same thing to her (big surprise).
It turned out to be a good thing for me. I had been kind of indecisively drifting around in life, and having a baby made me be much more grounded. I did work hard--it is difficult to be a single mom in some ways, but much easier in others. I treasure the memories of those days. It made me change what kind of a guy I would want to be in a relationship with. Of course, when I was single I thought I would be single forever and had given up hope of ever having one of those sweet, cozy families that so many other mothers in the mom's group I was in did. (interestingly, quite a few of them are divorced now).
Only a year later, I met a really nice guy I had gone to middle school with, that I ended up marrying when I was 22. This year is our 6th anniversary, and we still get along great. We had another baby when we were 23, and now I'm pregnant again (this one was planned).
One thing that really helped me was to be involved in a local mom's group. It was nice to meet other mothers with babies the same age, and there I was able to meet several other mothers who needed childcare, too, so we traded. One of them even lived just a few blocks away from the college. It worked out great, and it was a relief to me to know that my baby was being well cared for while I was at school or working.
I also realized that it wasn't as important to have a father as I thought. Babies are so attatcched to their mothers at first, and being alone at first meant that I got to establish what was normal for my family--I didn't have to argue with a husband about vaccination, or midwives or co-sleeping. I've heard so many mothers saying they would like to do such and such, only their husband isn't ok with it. My husband, being completely inexperienced with children, has just let me do all the deciding about such things, since that was already what I was doing. I was even disappointed with my second child, thinking I would have a lot more help with a husband, but found out that she only wanted me to hold her for the first year anyway.
Anyway, good luck to you! I hope it all works out for the very best for you as well!