Why don’t men seem to want to have conversations with me (that I meet in person)? I’ll say something light and casual and they are awkward about it?

I’m noticing so much with guys they just say hi to me and check me out a lot. I’ll try to carry a light friendly conversation and they’ll like smile and nod and then say they have to go! Lol.
I am told I’m really pretty and I’ve done some modeling so I don't know if they’re just intimidated or something. My friend told me their dickks probably get hard when they talk to me. Lol. But I don't know. I’m not coming onto the guys in a creepy sexy way. I’m just being normal and friendly and they don’t continue the conversation. Before all this I have caught them checking me out and they initiated some small talk and saying hi to me. I see them with others and they seem relaxed and will converse more openly.

Why don’t men seem to want to have conversations with me (that I meet in person)? I’ll say something light and casual and they are awkward about it?
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