How do I use a tampon???

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I'm too embarrassed to ask my older sister so I'll ask my online sisters instead! It's also embarrassing because I'm 21 and I can't ask any of my friends because they all use pads as well. But this summer I have HAD IT with pads. I got so sweaty and the glue makes my underwear smell funny and it keeps moving and then I end up messing up my underwear😩😡😡😡 I'm also ALWAYS paranoid, thinking someone can see it through my pants. So, I was wondering if I could get some help from you all?