These are just some off the top of my head that have helped me.

1) Don't be attached to outcome

2) Be decisive. When you have the opportunity to make a decision for the group do it, don't pass off your power/

3) Put energy into an interest. Whatever it may be, join a club for it, take a class on it, read some books on it, etc. You will be a more interesting person

4) Project your voice. Don't be obnoxiously loud but speak clearly and precisely. Don't talk quietly and make a speach out of what you're saying.

5) Don't be sensitive. Embrace criticism, welcome challenges. Laugh when someone pokes fun at you. Life is a lot easier when you don't let these petty things get to you.

6) Posture. It's damned near impossible to feel insecure about yourself when you walk down the sidewalk/hall/street like you're Vlad the conqueror. Stand with your back against a wall. Make sure that your heels, ass, shoulders and head are touching the wall, and walk away holding that position. Learn that and feel what it feels like to stand like that, but in a relaxed way. You shouldn't look like you're exerting any effort to hold that position, but instead that having perfect posture is simply the most comfortable and efficient means of standing and moving for you.

7) Smile when you walk in the room or "change frames". It's a simple way to show that you are completely comfortable in that setting, and have ownership over the situation.

8) Try and have more fun than anybody in any given situation. People love to smile and laugh, they just need an excuse to do it. Let yourself be that excuse for others to stop and smell the roses from time to time.

9) Don't feel a need to respond to every question

10) Never get too attached to anyone, anything, or any idea

11) Don't look for fun, Be the fun

12) Be bold without being arrogant

13) Don't judge yourself or others any more than absolutely necessary

14) Stand out without fear. Be the opposite of someone who caters to the masses, blends in, tries to make everyone happy, tries to make things work for everyone, tries too hard to be perfect, tries too hard for others sake.

Feel free to add some more good habits to the list fellow sedditors

Edit: Love the responses, when I have time tomorrow I will update this post with your submissions.

Edit 2: These are just my personal thoughts, take them with a grain of salt, what works for me won't work for everyone

Edit 3: Updated list