Well...this self-realisation of yours has already put you on the
path to change for the better. You probably don't realised it
because you're still with your old friends and they still have this
hard-coded mentality of you being a MCP. So it's difficult for you
to notice even the slightest change in yourself.
Keep your old friends and go find some new ones. Remember to
constantly remind yourself that you've been a MCP before and you're
not going to let it ruin your new-forged friendships with your new
friends. If you can keep your new-found friends satisfied and
without any complaints for you as their friends, then you'll know
that you've changed for the better.
MCP is part of the upbringing and you must realised that you
yourself have supported it for so many years in your life, so it's
not easy to get rid of it overnight. But you must realised that
once you've been a MCP before, it will remained as part of your
character whether you like it or not. But once you realised and
have suffered for it, you'll know that you never want to get stuck
in your life again...just like now.
It's really up to you to prove yourself once again to your
friends/girlfriend and yourself.
Good luck and be strong...losing doesn't means that you're weak, it
just means that you've taken on a greater courage to a stronger
self. 
