Mediocrity doesn't mean not doing anything famous. Mediocrity in my opinion is giving up on trying to do your best. By mediocrity I mean mediocre effort. This, I want to avoid in my life. When I choose to pursue any meaningful goal or passion that I have, I want to give my best effort for it. The rest is not in my hand and thus I don't have to worry about.
I have to remember that the joy comes from the process, not the result. This reminds me; I read somewhere when should we keep trying to achieve a goal relentlessly even if we fail? And when should we stop and move on to another new goal? The answer is, as long as you enjoy the process, keep going. When you stop enjoying the process, let go.