What i think? I think you should decide, and i'm totally cool with whatever you choose. Ain't it wonderful?
But really, i know that problem. I myself have nearly crippling issues with both indecisiveness and initiative; more precisely, i'm not much for coming to others and getting all "hey we should totally do this yo", i'd rather prefer hanging around and having others come to me. But the sad truth is this: It's just not going to happen all that often. You give some, and you get some. Sometimes, you just need to do something, and shit on the consequences. If you don't have malice in mind, then the vast majority of these cases should result in no consequences whatsoever. So what if you say something wrong? Give it a little laugh, the others don't mind. People make mistakes all the time, it's what makes us human.
Trust me on this, i KNOW that the first step is the hardest, i've been there, and i still go there regularly. It's easier to just sit around in silence, and sure it IS much easier to write what you think rather than saying it out loud, but it's not necessarily better. A little trick i've learned: If faced with a decision between two things and you can't decide, flip a coin, and assign each decision to a side. You'll KNOW if you don't like what it lands on, and in this case, pick the other. You will always have a subconscious inclination towards one of the sides, the coin just helps in bringing it out.
As for social problems, i know that feeling as well. My advice, however clichéd it may be, is to just jump into it. I did so back when i started at university, because hell, i didn't know anyone there, and they didn't know me, so i might as well make the best impression i damn well could. And it worked. But i digress, your situation is a bit different, because you've already been around people for a while now. Still, jump into the deep end where all the others are, because they'll catch you and teach you how to swim. In non-metaphorical terms, this means go talk to people, and they'll talk to you. You may feel out of your element at first, but don't worry too much about that. You're not going to get better at anything without trying, and this includes socializing. It's hard to step outside of your comfort bubble, I of all people know that, but it's SO worth it in the end.
And now my indecisiveness questions whether to post this, because i'm worried about this not being of any help, but hell, i'm trying my best and hoping to help, so fuck indecisiveness, here's the post.