Why do guys act weird/awkward around me?

Anonymous
I noticed that a lot of guys act weird around me. One day they would be fine, talking and smiling the next they would be awkward and closed off. One instance was last weekend when I went to a party and I saw a guy I knew there , and said hi to him and talked for a bit , then he just got awkward and walked away. The second instance was we were sitting down next to each other and I started talking to him again and it was fine but I still felt awkward vibes. He wasn’t like this before and would be open and he would be the one initiating conversation. I kind of brushed it off because he’s younger than me and that could be the reason. But this is just one instance and happens a lot with guys I know. Why do you think so?
Why do guys act weird/awkward around me?
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