Sometimes i want to do something and then a bad memmory of that thing holds me back, or i look at a girl i wanna talk to and then her friend reminds me of a girl that put me down a long time ago.
How am i supposed to deal with this feeling????

It is difficult to let go of your past and everything in it. Very difficult. But try to understand that your past is what has shaped you-- everything in it helped you develop to who you are right now. Let it go, release the heat and live right now while developing yourself further for the future.

First justify the reasons those situations might have happened. Then when the thoughts creep in, apply your justification quickly- then focus on the situation at hand. You can't let these thoughts from the past influence your decisions and actions today- because they are obviously not how you want to live your life.

I am struggling with the same problem. The best thing you can do is just simply move forward and be the person you want to be. If people who you knew from before don't accept the new you or criticize you, cut them out of your life. You don't need any negativity in your life. Meet new people and move on. Just remember not to burn too many bridges.

thanks dave134, that's a great way to put it.

stop caring what the fvck the other chick thought of u. go for it, dont miss out.

I've been there, dude, and it's perfectly normal. I think you've solved most of the problem being able to identify what's wrong. Knowing that, try this: next time you see a girl you want to go after, and you hesitate, tell yourself out loud (of course, out of earshot of anybody else) something along the lines of, "I'm only scared of approaching this girl because she reminds me of so-and-so." I swear to God doing that has worked wonders for me for overcoming fears put into me by bad experiences, and not just with women. Maybe it will work for you.