Will I ever be a good lead?

It has been eating me up inside. It's been 3-4 months since they dumped a lot of responsibilities on me and I happily took them, not thinking much about whether I will be laid off. Now I'm perpetually trying to be better and at the end of every day I have this feeling that I am not working as good as others (leads or seniors). If that wasn't a problem I'm getting into an inferiority complex. I feel I am certainly smart enough to acknowledge this and work on it. Are they deceiving me into believing this? What can help me, any suggestions?