So your parents will let you interact with 80,000 people on a skiing website with drug info, porn, and enough ignorance to fuel a plane around the world and back, but they don't want you talking on AIM with your friends...BRILLIANT!
alright heres what you do, i did this on my dads work laptop on vacation because he said he didnt want me to download it on there and aim express wouldn't work. As long as you're parents dont have like a download restriction on you it'll work. Go download aim, download the old version of it. Right before you install it uncheck all the boxes that say "put desktop icon" and "put start menu icon" and "put quicklaunch icon". Itll be installed and the only way you can get to it is the AIM folder in program files. Then just rename this folder to something else or just hide it or move it to a different location. Problem solved, you'll just have to find that folder and click on aim.exe to start up aim.
I don't really want to be mean but you are retarded. I was 11 when I got aim and could easily hide it. Its not that hard to figure out. I mean seriously, you're 15. You should know computer basics by now.