I'm not really sure what I want to do with my life or the type of person I am, any advice on how to figure these things out?

I have a hard time committing to anything, I enjoy doing a variety of things and are relatively good at them but I don't commit myself to mastering any one of them because after a while I'll get bored with it. I changed my degree plan in college to something more along the lines of something I liked at the time but I'm about to graduate and are having doubts again. In addition, I feel like I'm a different person on an almost daily person, sometimes I'll want to hang out with everybody and do fun things and others I'll pretty much ignore everyone around me and not want to do anything, some days I'm committed to my future career and other times I'm like "do I really want to do this?"