I can hold a conversation if the other person carries it. I can't initiate worth a damn. It gets a lot easier with people I'm close to, but it's still exhausting.
It took a solid three weeks for me to say a word to any of my coworkers when I first started. Good times.
Sometimes it's actually pretty great, since when I finally do say something it's usually a pun that's so terrible it earns me friends.
I rarely ever initiate conversation. I'll only typically do it if someone has introduced me to said person or if the person seems shy. I know for shy people it's really hard at times to initiate conversations, so I try to make an effort for them. I tend to pop in on the discussions or kind of like, make a terrible pun and then make friends.