How to be cold when your too nice to people (mostly to guys)?

BG_21
Lately I’ve been getting into situations where a guy will act interested and the next inconsistent. Then hot and cold, gaslighting/guilt tripping me and just using me for sex or some kind of intimacy. I’m a virgin and I’ve been used by guys twice. How does a girl become cold and mean to a guy that doesn’t want a friends with benefits relationship but a real connected relationship where is just not sex all the time? Or just wasting their time in general. Am I suppose to be mean to a guy if I don’t want something? I’m too nice sometimes and I just want to get my point across of what I want and don’t want.
How to be cold when your too nice to people (mostly to guys)?
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