Meeting new people (and girls) in your 20s?

Well, it's not been easy for me to socialize with people, I have always been extremely introvert, I'm trying to change that and be more open, but it's not easy, it's a process.

I'm 21 and I haven't had my first girlfriend yet, I'd like to talk about this with someone in person, the problem is that I can't tell any family member about this, because if I do I would get no tips, I would become the laughingstock of my family.

I live in Latin America, a town of about 36k people. What could I do to try meeting new people and girls keeping in mind my situation?

Updates
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My brothers know A LOT of people, and they have many people from our town on their FB accounts, would it be a good idea to add girls and try to talk to them?
Meeting new people (and girls) in your 20s?
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