We can neither condone or support a 14 year old buying airsoft guns.
We can't stop you from researching by reading, but we're not going to provide implied support by telling you which gun to buy. If you're really serious about this, we recommend you talk to your parents about airsoft. If they want to get into the hobby, you might be able to tag along. Until then.
"The Bird of Hermes is My Name, Eating My Wings to Make Me Tame."