Is a girl with only 1 sexual partner bad?

I'm 22 and I've only had 1 sex partner so far.
Do you consider that boring?
Should I have more sexual partners at this age?
Only had 1 boyfriend but I've dated many guys before.
everytime someone asks how many bf's I've had, I say one and they judge me and get shocked.
Why? I like to be selective on who I spend my time with. I understand it's all about learning but what's wrong with having 1 partner?
Is a girl with only 1 sexual partner bad?
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