Might want to read the FAQ before asking anymore question.
Short answer is no. If you're under 18, someone has to be supervising you when you use airsoft, and for sure it won't be one of us. As for games, it depends on the host, some only allow 18+, some alow 16+ with parental consent, but this also depends on the field owner for insurance purposes.
So yeah, unless you can get your parents into airsoft, it's not going to work. Just wait out a few more years, there are better ways to spend $1000 when you're 15. ($1000 is the approx cost to buy a basic airsoft gun along with BBs, Batteries, Charger, extra mags, some type of BDU, goggles, and other standard gears.