My happened

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My interpretation of what you meant to say:

What happened

What happened is I know there are interesting people to learn from. It's great, so I am happy and thankful!

(You would not say "my happened" for gramatical reasons, but I don't know how to explain, maybe someone can help with that) You could say "What happened was (that)...." or "This is what happened", "This happened to me.." etc. You would say for the state of happiness that you are happy. I don't think it's wrong to say stay, it just sounds more natural to say "are". I hope this helps.

My happened happiness

Hi, Lucrécia! I think this is what you mean, yes?

My happened

"My happened" cannot be understood.  Can you explain?

... is knowing that there are interested people available to learn.  It is great!  I stay happy and thankful!