Keep calm, this is still a big load of money.

Since you are this young , you may encounter some problems with cashing out large sums. ( At least this is what it would be like here in germany.)
Your Bank would probably tell your parents and you may not have control anymore over this money.

So you have to be smart about it , and while its painful to see it dropping wait a bit.

Cashout a small amount that you feel comfortable with having on your bank account via bitstamp.

Like others pointed out , use localbitcoins for some additional cash.

I will not advise you on any altcoins because you probably can loose a lot of the money there.

Hold the rest until you have an age where control of this money is guaranteed yours.