Feeling rushed to make a simple decision?

I'm 23 years old. I lack common sense or just slow. People have told me I react too fast or too slow. People say "stop think and react or do". I have tried both methods and still I do stuff that are stupid and awkward. I always feel like I'm too slow in thinking or too fast without giving it careful thought. For example, at work I often make the easiest tasks hard. It bothers me and I want this to change. I'm jealous of some people because they look like their quick with their thinking and yet they make efficient results. Please help.O

I've also been accused of lacking common sense and of being slow. My job is in retail and it can be a m*th*-******r because i have to focus on lining products up on shelves. I have a degree in Information Technology, but had to go on disability in 2005 because of depression. I'm enthusiastic most of the time, and energetic, and hyper.

Let me know what you think. Work tonight was tough.