I've got a few questions and advice for ya,
You profile says you are 15, before even looking at Airsoft kit, have you checked local rules about playing age etc, at local fields?
If your parents don't wish to have a firearm, or anything that looks like a firearm in the house, well its their house and their rules. You might want to go to a game or two, and rent equipment (if local rules/laws allow) and show your parents the sport, the players and the kit. After exporsure (ensure your playing with a group of non-retards), show them your legal data, and see what they say.
Maybe you'll find someone else to help you. Maybe black mesa... THAT WAS A JOKE, ha ha, fat chance.
My Buy/Sell 1337ness rating