The first step to sincerity as a photographer — ask yourself:

“If nobody could ever see my photos but myself … would I still make photos?”

If the answer is ‘yes’ … this is great! You will never run out of motivation to keep shooting, because it is for selfish (auto-telic reasons) which means you are auto (self) motivated to shoot.

But how do I know if my photos are any good or not?

Why do you care? To care whether your photos are ‘good’ or not is a matter of:

If I upload this photo to social media, how many likes and external affirmation will I get?

This ain’t a good approach, if your end-goal is to stay self-motivated in photography.