Loud mind

The major problem within myself is I think too much; too much that I tend to create complexity out of something which is actually very simple and straightforward to others. It scares me sometimes because the things I would never need to think about, I think about. I am often overwhelmed by thoughts and assumptions. Hence, making decision is hard for me in several ways. I have to think about everything, everyone, myself.
At certain times, I wish I could be as happy-go-lucky as some people, dealing with whatever the consequences are, so I don't have to bear everything inside.