[codegeek]

"especially with other Men", "I feel insecure that she really likes me"

This is the problem. You don't have confidence in yourself. You care too much about what others think of you.

To become a powerful man, stop worrying about what others think of you. I mean really stop worrying. Do what you have to do for YOURSELF.

Self defense class is a good idea. It might boost your physical and mental strength. Working out is also a good idea. Go do some chores around the house/apartment as well on a regular basis. For some weird reason, whenever I mow my lawn, I feel great and manly :)

Most importantly, believe in yourself. Tell yourself that YOU matter not just to others, but yourself. Love yourself. Be selfish. If others don't like you for who you are, then ignore them. Remember, be nice to people but don't be a doormat. If you believe in something, then stick to it (well unless it is illegal of course).

Read "The Virtue of Selfishness" by Ayn Rand.