Why does steam come out of my vagina?

This is a serious question. Please only answer if you can help me.
Ok so sometimes when I pee if I look down it looks like steam is coming out. Also sometimes there is this white stuff on my underwear. I think i should be having my next period soon but im really scared can someone please help me?
Update: And i have to urge to pee alot
Update 2: no it cant dont be stupid...
Update 3: That might be it. I live in canada so up here it is cold
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