If you consistently exhibit those behaviors you will be perceived, and perceive yourself, as kind. Traits, at best, only describe either our preferred natural style of relating or our better-learned areas. Toilet training, which all of us lived through, is a great example. Confidence is the conscious awareness of what we can, and cannot, do. 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.