Humans must surely criticise you on your way to success but you shouldn't let the criticism affect you or your quest. Your time is one of your greatest assets and you cannot allow some 'NFA' No Future Ambition individuals waste it for you.
Criticism is a must. If you don't want to be criticised, then don't try to succeed or do anything more than ordinary.
People must talk whether you like it or not but I want you to ignore the critics and get your eyes on the goal.