What's the purpose of life?

Well to start off iam 16 and recently i haven't been happy in the last 4 years. It all started when i moved from Los Angeles to Florida for educational purposes. I've been doing good at school and iam recently in the I.B. program. I have a huge goal to be a aerospace engineer. The problem is that my "social" life is a bit shattered but i think that things could be better if it werent for the confusion iam in. At the intellect side of me, iam fullfilling my goal, getting good grades and getting many recognitions, yet in my emotional side, its pretty much f***ed up. I dont have any close friends or ever had a girlfriend, but my heart wants it so badly. I am pretty open to people, yet i find they have a disinterest in me. Iam a nice person, from what i heard, but iam still stuck in the house doing my daily chores, and here in the computer. I go out to the gym, but there's a bunch of old people, lol, i never find a person of my age around my area. What is my purpose here in this world?