At every school for all of history it’s been considered “lame” to go to homecoming by yourself or with your friends.
But I can tell you what’s lamer than that: not doing what you want to do just because of what a bunch of folks that you don’t even like might think.
In reality, no one is keeping track of who showed up with whom. So, go and enjoy your friends that are there.
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In my opinion, homecoming, prom, the Enchantment Under the Sea Dance, or whatever might be a tough consideration for a first-ever date. People tend to build up all kinds of expectations, plus it can be expensive depending on how gussied up everyone is. I’d think the chances of getting a second date after that would be slim.
If you can, get a first date accomplished before homecoming. It doesn’t even have to be a real first date. Do you guys share a class? Can you meet to study? Or does he have an after-school job where you can drop by and say hi? The point is, find some kind of shared experience with which to break the ice, introduce yourself. Make conversation and learn more about each other. You can probably find a natural way then to bring up homecoming or some other romantic outing.