How you deal with feeling of being not included to any group?

How you feel when you’re not invited to somewhere?
I always feel left out and neither girls nor boys invite to any events.
And when I invite someone I always end up rejected.
I’m always alone, I don’t if it’s bad or good thing. I try to do things by myself but it’s so hard. I feel like looser.
And it feels everybody except me have their friends, partners they do everything together with.
How you deal with feeling of being not included to any group?
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