If you dont want people looking at you weird with 14 year olds, just get an mp3 player, some hardcore music and watch some instructional vidios and try to get some rides together near your hometown in the Rides forum. If you do this you will be just as good as anyone (If you practice). Heres a good website www.trashzen.com.
Oh and by the way, as long as you havent developed arthritis or have a broken boke, you can ride a trials bike.