So confused. Any advice or am I just being annoying?

So a bunch of people added me on Facebook from work. Yay new friends right? Well I find that I always see them liking each other’s posts/pictures on Facebook but never mine. Does this mean they don’t like me? There’s like 4/5 people I’m talking about specifically and they all like each other’s but never mine. Like it really makes me insecure. What’s the point of adding someone then? Am I overthinking or what? I just don’t get it 🤨