I am never going to have a boyfriend.. please help

I'm 17, I have never had a boyfriend, kissed a boy, or even had male friends or the confidence to talk to boys. Recently I found out that my little sister (13) is having sex with her boyfriend, my parents do not know, and I am very disappointed in her. I found a used condom is her bed after he stayed over (ew I know, he must have snuck upstairs in the night as my dad told him to sleep on the sofa for obvious reasons). Anyway, this made me feel really pathetic. I am really bad at making friends or generally talking to people, so how can I stop being so introverted. I am scared that I will get to my mid twenties as still be a virgin. Losing my virginity is another thing that scares me, I'm convinced that I am smaller downstairs than usual as I struggled to use tampons as even the smaller ones simply didn't fit. All this sums up to is anxiety towards the opposite sex. How can I overcome this?

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