How to let girl you want a more romantic/sexual relationship?

I tend to come off as the friendly and accommodating, therefore getting burnt because of this. I have always been nervous of getting in trouble with trying to hint at either a more romantic relationship or sex, because of fear as coming off as a creep. Not to mention seeing all the horror stories of guys getting lied on and having their life destroyed. Yet deep down I would love to have both, more so on the context of a relationship. Just don’t know how to correct my way of thinking, and glue to make moves.
How to let girl you want a more romantic/sexual relationship?
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