I am a strong believer that life is what you make of it. It is not everyone else who needs to make this decision. You are the one who has to live with it no matter what it is. Personally I would want to keep the child. But first I would have to really sit down and weigh out the pros and cons. You know like they told us to do in school, make a list and compare. The most important thing is that the kids are well taken care of.
Only you can honestly know if that is possible. Think long and hard and don't be afraid to go to a counseling center to talk to an expert, if nothing else to just get advice and have someone to talk to about your feelings on this matter. (most are free within income guidelines and sometimes you can even go in as a crisis and get the first visit free)
I was 16 when I got pregnant with my daughter. Believe me, no one wanted me to have her, and if they did they wanted me to give her up for adoption. At 16 I had to make a very adult decision. I went to my local counseling center and asked to talk to an expert, someone on the outside looking in so to say. It really helped me. I was able to look at what lay ahead fully with out influences from others that already had their own opinions.
My daughter just turned 12 and even though it has not been easy to take care of her, all the time; if I had to do it over again I know I would make the same decision. (with one big difference...timing, I would of waited)
Remember it's not just you that is effected by your decisions. Your kids are 10 times more likely to be effected by your decisions than you are. Kids are what my grandmother used to call "catch-alls". They catch it all, the good and the bad, the lesions and the teachings, whether you meant for them to learn from it or not, THEY DO!!! Rule of thumb: if you wouldn't want your daughter to do it then DON'T!
I hope this helps and good luck to ya!