Every successful and wealthy artist, novelist, inventor or interpretive dancer had their creative works rejected by someone or they felt what they had crafted wasn't as good as what inspired them. Stephen King needed a bigger nail to keep all his rejection letters and Steve Jobs was pushed out his own company. I could write a whole book about how superstars in their field had challenges like no one thinking their creation was very good or struggling in poverty for the first several years.
Everyone at some point either thinks they suck or are struggling to find an audience or are buried in a mountain of rejection letters.
If any of those things are happening to you right now, then you're following path of almost everyone who has achieved greatness.
Don't give up.