26M, feels like I am always a second option/ no option for everyone

I am always the second option for everyone. Feels like I am invisible to people.

Just today I was having a chat with one of my colleague at the cafeteria. Then one guy came and the guy said let's sit somewhere else and then they literally left and I ended up eating alone at the table. Such incidents have happened multiple times.

I feel like at this point I should just give up on socializing and just live alone. And with this condition I can't even think of dating.