I forgot to make my student loan payment this month.
Ah, that's unfortunate. That can be really tough to remember sometimes. I know because I've forgotten that too. But you'll make it up as soon as you can, I'm sure!
I'm scared it will affect my credit score.
As long as it's not too delinquent, and you have an otherwise good history of on-time payments, you should be okay! Try talking to your loan servicer, too. They can help.