How do you make friends at work?

I see a few women become close at work and they end up taking their breaks and lunches together. I used to have that but now my department is far and I don't get to see my usual co workers. I have become anti social and always take my lunch alone. A lot of other people do but sometimes I miss having lunch with people but I had bad experiences in the past that I don't bother anymore but at times it does make me feel a bit down. How do you all make friends at work?

How do you make friends at work?
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