yea try and type and talk more properly here
16 is a fine age to do Martial Arts. I mean I started when I was 13, only a 3 year difference and some people dont start till they're in their 20s. But yea using MA as a way for you to vent will eventually be bad. I guess you could think of a growing a bad seed into a bad plant. Find something you're interested in, not just something that could help you with anger issues. Because if your interested in it then you wont have any anger, and plus you'll enjoy doing it too.
"you're going to work till you wish you were dead and then keep going.."