Know how you feel, but the first thing to do is find out if you're really pregnant. How late are you? Stress can mess up your period and make you feel like you've got other symptoms too. If your period's late the first thing is to take a home test and see what it says. Take it first thing in the morning. That's when its most accurate. They can show a false neg but they almost never show a false pos. If its pos, go to the doctor. If you're worried about your parents going with you or something, there are clinics you can go to without your parents. They can also explain your options and its all confidential.
I'm not going to condemn you for thinking about an abortion. I'll admit it crossed my mind too for all the same reason you mentioned, and even tho I know a lot of people disagree I think its your decision.
One of the main things being pregnant has taught me so far is you make decisions you have to live with the rest of your life, and that incluides the decision we made when we got pregnant whether we realized it or not. I decided to have my baby. I'm 18 weeks now and I think I made the right decision for me and my baby, but I also know its not the right decision for everyone.
Good luck to you.