Random stuff without any evident sense (any evident connection?)

Good evening (at least for me) everyone.
I'm Lucia and this is my first note so far. Welcome to my fairy world! I've always been a competitive person. I keep focusing on random topics and shortly after thereafter losing interest in them. So I know what the redshift is (still love astronomy tho), I know what to eat to maintain a decent health, I know how to get fit (or: in shape), I know how to draw, I'm a quite a good writer, I know how to behave in stressful situations and I know how to practice the Heimlich Maneuver. I kind of like everything. I also like English and kind people, and this is a thing (better: something) that I'm not going to lose interest for in! So what if I get in touch with people from all over the world?, I thought. That's what I did, so I can finally pronounce 'thought' and 'taught' rightly (better: correctly) (thank you Ben, hope you're fine!). Yay. Anyway, I think it's really cool helping people who want to learn italian. And I'm not a patient girl at all so I think it's a good exercise for me. Oh and sorry if I seem annoying; or : or . or even -- (but not a comma) I find it difficult transfer my personality into a language which is not mine.
So I think I wrote enough for now and the next ten years! Write me if you need help and I'll try to be useful in any way! And please correct my mistakes :)
xxx

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Brava.

'Health' is a mass/uncountable/noncount noun, so to use 'a' before it is not correct in standard English. You cannot (usually) connect two independent clauses with a comma.