Why am I never asked out? I am flirted with but never anything past that and I don’t understand?

I am usually the 3rd wheel and I’ve accepted it but I don’t understand how to change this. I’m told I’m pretty and always have been, and I have friends of all types. Guys flirt but it always ends there, i recently tried to get into a friends with benefits with a guy I know but he never really was open to it. I was always told your time will come but now im older and nothing has changed, I’ve seen girls right out of a relationship have 5 guys and I don’t get it. I can’t be the only girl that struggles this way, my friends say they don’t know why this happens to me. I just want to break out of this because I never had my chance to be free and have fun, im always just alone and I don’t want this to continue but I don’t know what I’m doing wrong.

Why am I never asked out? I am flirted with but never anything past that and I don’t understand?
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