Am I crazy?

I’m gonna turn 28 in June and I got out of a 2 year relationship November of last year. I’ve been dating a guy but I feel like I’m never going to have kids. My 24 year old sister has a child and is pregnant and my 18 year old sister is 4 months pregnant 😢 I feel like I failed at life. I really just want a baby 😭😭

I really want to be happy for my sisters but I’m just so jealous and I can’t help it. Btw I’m the oldest