sentarli, Propecia is only approved for use in Men over the age of 18 and above so you are good to go
I know many other ways that you can kill your sex life without taking propecia LOL
But you must know that any propecia side effect can be reversable in 2-3 weeks after stop using it. Those who do experience side effects will also be happy to know that these side effects are very common at the beginning of treatment while your system is adjusting itself, and typically disappear after a couple months.
So you will know only if you try, this side effect can happen in about 5% of the patients. it is a small percent and the chances you will get this side effect are not big.