Why delete posts that are actually RELEVANT to the topic?

[Victoria is 18]

I just don't understand how my replies to some topics could be so irrelevant and "low-quality type".
Dude, I'm struggling here. I'm trying my best, ok?
Before I even post my reply I read it like 10 times, because my friends who invited me here warned me that you guys delete irrelevant posts. My replies were on point, it wasn't even far from the topic. I had some good long ones too. I feel offended, this is too hard. 30-post goal is too hard. I had, I think, five posts. I just slept and now I only have two. Wow. I can't, I just can't.
If someone can reply and teach me how to do things here, I would be extremely greatful.