I know it was a rough start, but you have to reject your outsider mentality now. Once you start believing that you do not fit in, you create a self-fulfilling prophecy in which you will honestly not fit in because you will stop trying. Maintain a positive attitude, think about the person that you want to be socially, and emulate it. Don't stop saying whats up to your roommates when you walk in and ask what they're doing later. You are TWO DAYS into this, you can't expect to be best friends with people yet but RIGHT NOW is the time to forge relationships and set the tone for the rest of the year.
Besides just remaining optimistic, two other points that you should keep in mind:
You WILL find someone that you connect with, even if you feel like you are not very compatible with the people that you are meeting right now. Not everyone in college is the same, and you will find someone, or a group of people, that has a similar personality and sense of humor as you. Humans cant be expected to bond with everyone they meet, but with the variety of characters at a college you will with someone.
Get involved with things that interest you to meet new people. I joined the school newspaper and now the people there are some of my best friends in the world, we hang out all the time, party together , and my college experience would be pretty different right now if i hadn't found something on campus that I wanted to be involved with.
Trust me, I know how you're feeling, I've been there...I know people that are there now and I'm getting them out of it too because I know the situation. If you need more help, if you have any other bad days or need encouragement, send me a PM.
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Classified.