Is it ok for me to be selfish?

It's my birthday, but it doesn't feel like it. Nobody is really saying anything to me, no gift, no cakes, no post. Whats crazy is that i dropped everything for them. Even took unpaid leaves at work and spent more money than i could for them on gifts. Yet here i am, in my room alone crying. I threw my first birthday party aswell, paid everything myself and just asked them to show up. Yet only 3 out of 15 did and they seemed ready to leave at any time and annoyed. I tried to stay positive and open minded like normal but its becoming really really hard to do so. And im sure reddit aint the best place to vent but I think its the only place I can actually do so. I should mention a bunch canceled on me the night before and the day of after i already had bought all the snacks, drinks, and food.

So is it ok for once to be selfish and think about myself only from now on instead of pushing myself to listen to others and be there when no is there for me? Or am I overthinking and being extra for no fucking reason?