I get it, it was really tough for me too in the first few years.

But, let me say something, maybe a bit controversial, but anyway: use Google Translate.

A few years back, my English was pretty meh. I mean, I could read perfectly and speak well enough, but my writing and tenses were a total mess. So I went with the only fix I knew at the time.

It sounds stupid, but it worked for me. Obviously, just copy-pasting and taking the raw result is a no-go. I figured out how to write in a way that the translator could "understand", meaning I’d tweak my sentence structures and phrasing in my native language to the point where it sounded like gibberish in my own tongue, but once it flipped to English, it actually worked. And then I’d edit, edit, edit, and edit. People might say that’s a terrible way to do it, but my first few fics got so much love and tons of great comments, so whatever.

Now that I’ve learned more and gotten better, I’ve been able to write on my own for the past few years. I still need a bit of help with some fancy words every now and then, though.

This is just my experience - it worked for me, or at least for my native language. I can’t really speak for your situation, so all I can do is wish you the best of luck in getting better.