Okay you aren't rude buddy. You're literally one of the nicest people here. And probably one of the nicest I've met...
If you don't get people's jokes than that's fine I'm 17 and I still don't get a lot of stuff understood.
And taking everything seriously is okay. It may be an issue but it can be worked on, I used to take everything so seriously too.
You're not a failure, you're a good person. And if you need someone to talk to then I'm here, or better yet talk to Pearl in Real life