There is NOTHING WRONG WITH YOU, based on what you have written in your letter.

First of all, happy birthday! Enjoy the day. While it may seem like 15 is near "the peak" of adolescence, age is often just an arbitrary number and it doesn't always mean as much as it seems. Just because you are a certain age, it doesn't mean you should have a certain amount or kind or experience with boys, dating, kissing or sexual activity.

What you choose to do or not do is based on many things, like maturity, finding willing partners who you want to get involved with and your own comfort level. Just because your friends talk a lot doesn't mean they are actually doing more than talking; nor does it mean that they are ready for, or are necessarily enjoying, such activities. There's no logic or formula for how these things develop.

If you are eager to get involved with boys, you could consider approaching one you like first. Sometimes boys can be pretty shy. Some may have crushes on you and are afraid to let you know. However, there is nothing wrong with being alone if that's what you want, or if you feel you aren't ready to get involved with someone for whatever reason. It just may not be the right time for you. But when things develop--and for most people, they do eventually--it will probably happen naturally.