I've thought about this a thousand times as i sometimes feel insecure about my photos... once speaking with my dad about wines he told me that the best is not the most expensive nor the oldest but the one you like the most, even if it's a cheap one. So that made sense in photography to me.
After that though, I've found that the ones I like the most are often liked by other people so that's good enough for me!
Hey mate! Don't get frustrated over this... I'm a Formula 1 photographer and I shoot about 4 to 6 thousands photos on a weekend and just keep like 50 at the end. Just the best ones.
Something that worked for me at the beginning is just taking pictures of everyday objects and scenarios in different angles and lighting conditions. This way you can improve your composition and then make it shine when it matters.
Also learn editing. It's important to make sure the picture looks the way you intended from the beginning. Now, dont over do it as it'll look fake. Just some minor touches in lighting and color in my opinion.
Hope this helps!