Help! First time mum and feel I’m failing!

I had my baby girl on November 2nd, but she was 8 weeks early! I know a few other people who had babies around the same time, and I see their posts of their babies and think “my god, they’re doing so well. How do they do that?”. I know my baba was early so technically she will be behind with development but I can’t help but feel as though I’m being a terrible mother and it’s my fault. Honestly, I think she’s doing really well for a premature baby, but I still feel as though she deserves better.

Is it just me? Am I being overdramatic?