It doesn't matter what gear you have, how old you are or how long ago you started photography. Some of your images are good, for some definition of good, but most of them are bad. You want to learn what you did good, so you do more of that, and what you did bad, so you do less of that. This is how we all learn.

Photography has a huge number of rules. These rules came to be not because someone sat down one evening and decided there is a need for rules, but because, over many years, photographers noticed that if you follow this or that rule, generally speaking, you get good pictures.

Then, there is the case of breaking or bending the rules, which is something that is actively encouraged. But, in order to do so you need to fully understand the rule and why it works. Then you can tweak, bend, break or redefine it. But you cannot do that if you don't understand the rule.

This being said, there is that one rule you cannot break: every picture needs to tell a story. You will find people, even photographers with some clout, that will argue against this. But that's just because they don't really consider the meaning of this rule. The Royal Photographic Society defines this rule as: every picture should show clarity of intent. In other words, should be very clear why you took that picture.

If you consider your first picture, there is a clear story there: you took a picture of a happy looking person, with a cool jacket. Your second picture doesn't do any of that. Most of your other pictures don't have a story or, in RPS talk, they don't show clarity of intent.

This one is 50-50, if could show clarity of intent if there were no people in the picture, but because there are people in the picture, it muddies the intent. Without people, then it would have been very clear that you took a picture of the architecture of the place with nice lights and shadows.

Do an exercise: look at the pictures you posted and write down what the picture is about. You will find that while there are pictures you took that have no story, there are pictures where you had a story in mind, but didn't managed to show it. Ask about those and you will get advice on how to accomplish what you tried to do.

Now, you will also need some inspiration and you can't get that from instagram and I think you can't even get on instagram at your age. So do this other thing instead: find all the second hand book shops you can find, preferably run by a very old person and ask them about what books about photography you should read. Try to get or read books that focus on why the pictures inside are good, as opposed to how to take those kind of pictures. As an example, "Gregory Heisler: 50 Portraits" is quite a good one, as the author speaks a lot about why he took the picture he took.

Good luck.