First of all bro, why do u aspire to be a jerk. Like "my goal in life is to be a jerk" - come onnnn.
2. U sound like u may be from the hood... so how the heck were u raised to be shy and unconfident? No parent or mentor wants the child to be insecure and spineless. BUT it IS easier to live that way (as a beta nice guy, as much as i hate the term "nice guy" because its being misused), therefore people justify it by saying oops, its not my fault, I was just BROUGHT UP this way.
3. Because u are a young MALE you are already "testosteronized". Unless there is seriously something wrong with your health. Its not the digit, or a percentage of a chemical that u get after blood test results... it is how u USE it.
4. Yes. If you want to be a jerk, go ahead its not hard. If you ask i can elaborate on how.
But you sound like me 2 years ago, when i went from a nice guy to a jerk... then to a depressed beta-jerk, if you will; and finally as of recent discovering and uncovering the alpha in me...