It feels very good when you find a girlfriend that actually likes/loves you for you.

Dating in general can be very stressful, but can be equally fun and exciting. Ultimately, be brave. If you have a car/can borrow your parents' car, and you're allowed to date (some parents are more strict than others about this kinda stuff), ask a girl you like to go to the movies or something.

Basic tips: Offer to treat her to it. Be polite, open doors for her, buy her a drink/popcorn. Don't expect anything from her in exchange. Maybe after the movie, go grab some food somewhere (doesn't need to be fancy, just somewhere you both like - fast food is cheap and acceptable in high school). And if you both seem to have had a good time at the end of the night, ask her if she'd be interested in doing this again sometime soon.

Use the evening as a way to feel out whether or not you'd enjoy spending more time with this person. If the answer is yes, then they might make a really good girlfriend. If the answer is maybe or no, then maybe think twice about that second date.