Mistakes on the part of Nature

I struggle a lot with not feeling like I'm important to people. I don't know why this is. I know it's not true. People don't need to be paying attention to me or invite me to everything for me to feel important, but sometimes, a lot of times, I just tend to feel ignored or left out. I'm of the opinion that it is completely my fault because people really aren't ignoring me that much. I'm just considering every activity without me ignorance and that is not necessarily true. Who wants to spend all of their time around me? I mean, there's no one I particularily want to spend all of my time around. So why do I feel like this? ARGH! It's really very frustrating. I hate it. i'm working on it, but I really don't know how to get better at it. I figure maybe I just need to widen my circle of friends? At the same time some days I just like to have my time to myself and more friends means more time commitments. ugh. Life is confusing. And it makes me crazy. I need to chillax.