Should I Become An Actor?

The answer to this is No.  There are too many actors in the world and not enough work, if you can possibly go without becoming an actor, if you could be happier in another profession or job, then do that instead.  The money isn't great and often you aren't treated with the respect you deserve.  Most actors believe in the all or nothing principle, which means that they believe that by putting all their energy into it, that it will happen.  Sorry, it won't.  Well, not like that anyway.  

However, if I haven't managed to put you off, and you are willing to live in poverty all of your days, then that is something that you should perhaps think about doing.  But just because you were good at something in high school, doesn't mean you should think of doing it for a living.  I was good at throwing geometry instruments across the room like Ninja throwing stars, but I wouldn't consider doing it as a way to make money.