I don’t belong anywhere

For my whole life I’ve just felt like I don’t belong. Even with other weird people I just don’t fit in. It makes me feel really badly about myself. I found out that my coworkers had a get together and most people were invited but not me. That hurt. I don’t understand. I don’t know if it’s my experiences and what I’ve been through that isolate me, or if there’s just something fundamentally wrong with me, but I just can’t seem to make friends. I never feel like I belong. It reinforces my already negative opinion of myself. Does anyone else feel this way or is it just me?