Yes and no. In a casual setting I've never tried too hard to make a good first impression...I just present myself as honestly as possible and let other people take it or leave it as they will. You can't please everyone, so the simplest thing to do is not to try and please anyone, then concentrate on those that you do please. At least, that's how I've thought for a while now. I really don't care what people I don't know think of me.
But people I do know, and those I care about...yeah, their opinion of me matters a lot to me. I'll try my hardest to keep their good opinion. I won't compromise my identity, but...well, everyone needs at least one or two people who like them, right? It's very lonely otherwise.