we were all 13 once mate. so we know what its like
my first scratch build was the FT Bloody Wonder, with a 1300mah 3s battery its an absolute missile in the air, but with a 500mah 2s its much slower and easier to handle. personally i also think it looks bad ass.
If you're not in the mood to try an ft flyer (btw you totally should) i understand. maybe give the bloody wonder a go, its not too tricky to build and it flies pretty well. start off with the 500mah 2s, and when you've got the hang of it, put a bigger battery in it and watch it really jump to life (vertical take off anyone lol)
This is the video of my maiden flight with it.
http://www.youtube.com/watch?v=HYw_uZRThtg keep in mind it was my first rc plane i'd ever scratch built, and the first rc plane i'd tried for about 10 years, as i crashed my one when i was younger and gave up on the hobby. (thats why people are suggesting planes like the ft flyer or the nutball)
Have you done much flying on an simulator? if not i strongly recommend you do, trust me, it'll save you a ton of pain.
Long story short, build the bloody wonder and have a bloody wonderful time