How do I stop being insecure about getting cheated on? My

Because you're not confident in yourself and is scared of her meeting someone better than you/ potentially slowly losing interest in you. Just be who you are and keep the lines of communication open, after that it's all in the wind. Either it's meant to be or it's not.

Try to focus more on her body language, pick out small signs that tells you she's happy with you.

People are fucked up amd make stupid decisions
Meditate more senpai

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>she knows males and females can't just be platonic friends unless someone is gay/family

>she has her ex and previous hookups on Instagram

One of these things is not like the other, OP. While you clearly have some insecurities, it doesn't at all seem like she genuinely "knows" males and females can't just be platonic friends... especially not if she is keeping them as friends on her instagram.

She is most assuredly talking the talking, but it doesn't seem like she is walking the walk.

Ask yourself, and be honest... if she didn't maintain contact with her old flings, would you be as worried?

Voice your concerns with her if you feel that it has the potential to genuinely impede your relationship and you truly want it go somewhere with this girl. Don't be possessive or controlling and certainly don't imply she should or has to, but if you tell her you find it uncomfortable she will presumably take action to change if she truly is as amazing as you imply.