Well, I'm a 14 year old and I've been drawing for 3-4 years, but that doesn't have a thing to do with improvement . Usually people improve quicker than this, depending on what they draw and how. And I have noticed your gallery is filled with animals, but it's rather limited. I checked your gallery... It's why I asked.
I know it's like that, I'm talking about general stuff.
I'm younger than you, then. To be honest I usually draw similar things due to boredom. As in, I have no idea what to draw, so let's draw something that's pretty usual. Most of my experimentation goes towards my eye style since I'm never satisfied with it, though I think I've finally found something I like. I'm a lazy tard so most of the time I can't be bothered to add backgrounds, so again, little variety. My improvement is mostly small things... maybe the ability to pose, shading, things like that. I have (partially) figured out foreshortening maybe a month ago though, so that's nice. Someday I'll summon the patience to actually study art things like anatomy and perspective... why am I so lazy
Still, doesn't have a thing to do with it. I've then been drawing a bit less, yay? *shot* Ugh, I feel you- I'm SUPER lazy myself. But, I think you can try just doing lazy gesture sketches on paper, it's super effective :'D *shot for Pokemon wording. Trust me though, you don't have to spend too much time on one thing. Ffff, good luck on that, I never managed to do so ;u;
I actually have a bad habit where I can't get past the head a lot of times. I put too much detail into the head and then once I get to the heck I start to give up because I've basically convinced myself a while ago that I am terrible at attaching the head to the neck and making it look right. This usually prevents me from going too far. And then there's my classmates who like to peek and because I'm kind of shy I start to steam a bit inside. So yeah, I'm kind of a perfectionist. (This is why i really, really need to study anatomy so I can stop hissing at myself for my freaking necks)
Like I said, I understand you >.<. But, don't worry about the details! It may be a bad habbit, but can be easily fixed with a wee bit of will power . When it comes to sketching, try getting out the form of basic things- and in time, when you got that down, add details "according" to the drawing (as in, don't go on one thing at a time). At the same time, draw more compex scenes from photos- the different things you do, the more you get better in general. You'll have a better understanding of things, trust me :3. Annoying classmates? Ugh, reminds me of a bully -___-. I thankfully finished the 8th grade, and so I don't have to see him anymore.
I also am one of those people who prefers having clean sketches so getting loose is hard. (and I don't have a stock of photos and I'm not used to using references so) It's more of annoying-only-in-my-opinion, to be honest I get compliments with my drawings but my low esteem makes me brush them off (which is really not good for myself but bad habits ahah)
If I do improve it'll most likely be in anatomy, lightsource, and shading, since to me the most I've really done is stop drawing people like they're all chibis and get a better style for facial features (which I still haven't pinned down btw, I'm constantly changing it because damn I can't find what's comfortable for me anymore)
If you really want to get better, occasionally I go on a 'style exploration trip'. Basically, after looking at some people's art that I really like, I just scribble down a drawing in whatever style I feel like. Doesn't matter if it's totally different from my usual style. Just let the bottled up feelings come out. If you end up liking how you drew it, then great! Here's an example of one I did. It's actually a pretty fun way to draw in for me. I also do some sort of slit eyes and really cartoony noses.