i'd agree with usedtofly, on the uni front, make sure you really dont want to do it! (as the bonuses far out weigh the negatives) and if you have got a bit of money saved now doing say and aerospace degree (i take it you enjoy aerospace) you could do you ppl whislt at uni and they will both help each other out!
I dont like it when people say uni is a waste of time because thats rubbish! best years of your life i'd say!
i would stay away from an ....ology or a studies thou =-)
End of the day do what you want to do when your young as you may not get another chance to be able to do somethings! i'm 20 n wish i 18 starting uni again lol