Tenses are one of the more difficult aspects of English, as I noted, yes. Luckily, English allows for asimplification in most cases. English seems easy to me because I’m a language instructor (not teaching English) working with students from all over the world and they almost always rate English as pretty easy compared to other languages they’ve learned. One of my current students is a native Arabic speaker who found English easier than Persian in spite of the increased linguistic distance, for example.

The German and Spanish Wikipedias both also include pages for characteristic tenses and modes, respectively (the reason the English page for that case is split is because it’s got a different name in English). Every language has complex aspects, but one does not need to learn how to properly distinguish between “I would have been going” and “I would have gone” to speak English at a B2 level.

I’m sorry you’re not confident in your English, it’s great. Perhaps you haven’t mastered the tenses (many native speakers also have difficulty with them), but you are perfectly competent at communicating in English.