How can I be more confident and flirty with women my own age?

I'm 20 and always flirt and have a lot of older female freinds because of this. They are mostly mid 30s 40s and some 50s but women my own age 25 and under I become a lot more shy, less outgoing and become quiet how can I fix this? as it's realy keeping me single.

How can I be more confident and flirty with women my own age?
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