That would probably be the best idea since you aren't very clear on what you did. The changer you mentioned could be the front derailer, rear derailer, shifters or probably other things. The frame itself really shouldnt have any screws you can bend.

I am going to guess you bent your rear derailer. This can easily be replaced. My suggestion though is to take it into a bike shop and have them look at it. If you can get us some pics or figure out the correct terminology to describe what is wrong we might be able to help a bit.