You know, the problem might not be that you are no good with girls, but rather your friends are so good they overshadow you!
For example: they talk so much that it's hard to enter the conversation, and when you do get a chance to speak, u're just like "..." then "I don't know.... yea"
I was kinda like u in high school, very funny, young & handsom, big social circle, good talker, i was invited to top tier parties, etc... Funny thing is, my friends were also "the best on the block, big pimpin, neighborhood superstar" --> one was always impressing me with these superhot friends, the other, getting laid like a prostitute on steroids, and another.... oooh... anyways back to the point!! U see the resemblance of our situations? and coincidently i was just as terrible with girls!
the problem is ur friends are too controlling of the conversation. It's the kind of friends that don't make good wingmen... not all of them, maybe just one of them, and he may be at the root of of worsening your problem. think: does your friend give u opportunites to enter the conversation (ask 4 ur opinion, turn to look at you, or even tell u "go talk to them while I'm busy") or does he always do 1 on 1 convos with the girls?
if it's the case, then god bless, you're not so far off from potential tru playa-hood!
This is what I did: I broke away from this (great) friend of mine! it wasn't intentional though. even to this day, when i'm around him and he goes to talk to a girl he knows, I break off & go talk to someone else then meet up when he's done instead on standing there silently, feeling like a total looser!
You gotta take that distance from 'em, talk to new girls like
Extremo says! also learn to be more dominant in the convo! deeper voice, lowder voice! interupt to say what you gotta say! Learn about Body Language! and check out self-esteem stuff (inner-game).
One thing about these kind of friends: they got a lot of skills and a lot of understand about inner game, plus and they got valuable experience in relationships, and you can learn a lot more from them than from reading books & stuff. U just gotta find the RIGHT questions to ask them.
Develop ur social skills/ game independently. If ure like me, it shoudn't be too hard and that great sens of humor should eventually kick back in!
note: I don't mean "Leave" that friend when I say break away from him, i just mean develop ur lady-conversating-without-stress skills without him being there to stop ur social development! When u'll be ready, u'll know and you'll be able to apreciate his friendship much more.
as for me, that friend of mine called me while i was writing this... we're going out to the bar to play some pool with a couple of (very) hot girls tonight

and I'm not counting on being silent!
Good Luck Bro
btw, what does the T stand for in DiceBoy T? just curious