How can a girl become conventionally stunning?

I’m pretty normal sized (125 at 5’8”) so pretty normal/not thin and not really tall. I have long-ish hair to mid back. I dress pretty well, though I’m often in my gym clothes. However I still don’t think I look that good. And no one really compliments my appearance, even guys so this shows me I’m not that good looking. I want to be stunning and feel way better about how I look but no idea where to start.
How can a girl become conventionally stunning?
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