Why do women show me more attention in person, rather than online?

I am 24 year old male who is decently attractive, however in person I have noticed that women will go out there way to be nice to me, speak to me even if I don’t know them and a lot girls in the past have approached but I declined because i think they was just using me for attention. Although, online women will not respond to my text, if they ask what I look like and I send a pic they will often delete me which is making rethinking, am I as attractive as I think I am.
Why do women show me more attention in person, rather than online?
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