There's always going to be someone out there... who doesn't believe in you or who thinks your head is too big or you're not smart enough. But those are the people you need to ignore, and those are the times you need to just keep doing what you love doing.
So many older people, they just sit around all day long and they don't get any exercise. Their muscles atrophy, and they lose their strength, their energy and vitality by inactivity.