Holding a Conversation is alot like learning "The Game". You might start off being bad at it and not knowing what to say/do in certain situations. But what they both have in common is you can learn to get better at both!
If you cant hold a conversation then learn some new skills, read some interesting books, watch some fun movies.. ANYTHING that you think you could talk about to a HB.
I admire the fact you admit that you cant hold a conversation, because that shows your ready to do something about it!
My advice for you is to go out to clubs/bars/libraries etc and just to talk to as many people as you can, wether or not you want to pull them doesnt matter, its purely to build up your conversational skills.
Another thing that may help your conversation skills would be for you to sign upto an online social site like faceparty, plentyoffish, face-pic etc. This way you can experiment messaging random girls and seeing what kind of outcomes you get, then once you have messaged them a bit more you could get there msn/yahoo addys and talk to them on that. It will help you ALOT, trust me
Orthodox