Pls Help!!! Dont Know Why Guys Intentionally Ignore Me???

Guys have been doing this to me since 9th grade. They talk to every other girl except for me. Like at lunch, they intentionally say hi to everyone and then just skip over me!

And like, they'll go up to any other girl and start
talking to them! Why? If I say something, they'll immediately respond, but it seems like they generally ignore me!

I know it's not just because I'm shy because they start conversation with this other girl who literally says nothing!

Pls Help? What should i do?