Did they already know these women they were laughing with or just met? Wete they randomly there and guys approached and started laughing? You might be better off talking to friends about science then.

not everyone woman likes to laugh about silly things. If you find a woman who likes science then you two can talk about science. Yes approaching women you don't know and start talking about science might not work but so is talking about silly things! Women are all different. Many don't go to bars and don't talk to strangers there ( even if they went there with a group) etc etc and you have better luck meeting them in a library or advanced class or museum etc

I of course agree that being shy makes it much harder to approach people. Especially people you don't know. No doubt about that.
You might have to go about it differently

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