At 19 your very brave to put all your money into one stock, however, dont panick. If you loose it all, theres plenty of time to rebuild. If your worried set a stop loss, perhaps be prepared to lose a $1000 or $1500. The upside of Pre is the exciting unknown, just make sure you can sleep.
Whilst it would be nice to find a stock that makes you rich quick, its worth pointing out CSL shares are up over 400% plus dividends) in the last four years.
Places Like HC are good to get tips and info ,and there are very genuine people on here, you still need to do your own research too.
Good luck
Oscar
PS I hold PRE
PRE Price at posting:
0.0¢ Sentiment: Buy Disclosure: Held