Dear arta814, first, welcome to the forum and I hope you'll stay with us for a long time. We'll help you through this, one way or the other. If you've had the chance to read other threads in this forum about teens and their issues, you'll know that you are not alone in this and that it's a natural growth process.
Just take it slow, don't worry about what others will say or do. Believe it or not, they are just as anxious and comprehensive as you are about life and what's still in store for you. Don't let them tell you any different. Most of the time, when kids your age act like they are older and wiser, they are just trying to 'save face' and don't do a good job. Then, they pick on someone that is newer at the dating game than they are, just to make themselves feel better.
As long as you treat the girls with respect, they cannot say anything bad about you. Just be your normal self and, believe it or not, ask your parents for some hints. Remember, that your parents have 'been there, done that' too, and it would make them proud to help you out in this.
If you are shy about talking to your parents, then just let it all out here with us, and we'll do the best we can.
Good luck, and enjoy your youth as much as you can.