Afraid you might not get much help with this issue as generally the rules of the forum state that members cannot assist anyone under 18 to obtain an airsoft gun. Unless you get age verified, you might not find a lot of help.
I will say that that might work O.K. if your just target shooting, if your looking to actually play a game of airsoft you will get destroyed. I would wait until you can afford a gun in the $300 range before playing competitively. Also, if you do plan on target shooting, don't do so unless you live in an area that has no by-laws regarding the discharge of a firearm or on a piece of private property with a lot of acreage.