Will this be accepted by my customers?
Will my readers like this?
Will this be considered good enough?
Insecurity is inherent in all of us.
The best bet is to look at your art along with the others. To join the tribe. To laugh and cry and be inspired with them. To realise that what you do is personal. Not to you solely, but to your tribe.
Shipping your art is not for yourself. It is to serve your tribe.
Where then is room for insecurity?