To be fair, you are always on the cusp of being fired/laid off. Even if you're the backbone of the company, the best employee, etc.
Also remember that expectations of young people in a lot of businesses are very low. That's why they pay the young so poorly 🤷.
If you seem to be getting work done and your boss isn't bitching then you're doing exactly what you're supposed to be doing. Don't worry about it.
Also, when you're young change jobs every year or two! It's the best way to make considerably more money over time and no, it will not hurt your resume in the slightest. It merely shows initiative and the fact that everyone wants you (i.e. you're competent).