This is in addition to having skill. Some people have strong skills and very little confidence. This is a condition where a person has the skill or competency but does not know or believe they possess it. Thus, they live forever afraid that someone will find out that they are, in their minds, a fraud. This distinct lack of self-awareness blocks the person's confidence.
Confidence requires an honest self-assessment.
If you want to be the best in your peer group perhaps you can. Your goals need to be in the context in which you live, and need to accurately assess your potential. These goals also should accurately reflect your willingness to work to achieve them. If you don't plan to work diligently, lower your expectation. The goals have to be realistic.