Is it reasonable to feel bad on my birthday?

It’s my birthday today. I do not feel so good to celebrate. Don’t know why. I’m 25 but I don’t feel that way. I am looking very young and not at my real age. Girls say I’m looking only 18–20. I am studying and working so hard. I’m doing a list of my life, what I got today, and it seems like other people at my age have achieved much more than me while I’m a little stuck. Is it normal to feel this way?

Just wanted to share feelings.