I'm being harassed

Oh boy.. Idk if this is weird or just creepy but someone is obsessed with me. They keep sending me weird messages and keep saying "When can we start dating?"

Funny thing is, I barely know them.

So please tell me, what should I do?

you should say "never"

Either the person in question is very young, does not know how to take any social cues (however many you can pick up on the internet) or is doing it purely as a joke. I haven't seen any messages of the like, I'm leaning the first two options.
I'd probably just set yourself to Do Not Disturb and you won't get pinged for any messages. I'm unsure if there's a block option on here.

In the event it's the latter, you can joke around back and forth but it's honestly not a likely possibility and it'll get old pretty quick.

who kept on doing that? Just ignore that user and report it to one of the admins

i got thatalot and eventually they have stopped

You can ignore them

Pass me the username in DMs, I'll deal with it

Me : okeh i feel not good...
Me : !!!!!!START REPORT THIS GUY!!!!!!

Freeby inspired of ERREHACHECÉKAÈS : Life is too short for takes care of things like that. You should ignore this, and just report him if that's turning harassment or bad words or things.

Lely's Advice = says to him "But of what I takes care, me ?" and just leave this dude alone, because he need. Just don't care. Stupid ppl. Or just person like Queensome who did to me the same thing.