What do I get better when I see that my high school peers are getting married or have children?

I mean don’t get me wrong I’m really happy for them but some of them I know are getting married or having kids. Or already married and already have children. One of the girls I know it’s like my age and she’s been buried for about three years and she’s having her first child which I’m very happy for her. She’s having a boy. Anyways I am 28, still single and then usually don’t seem interested. My friends think I’m way too desperate and I’ll go is going to ever want to have a relationship with me if I’m just being desperate and just attention seeking. Desperate they may have a point but the attention seeking I don’t agree with. My relationships don’t last very long and I’ve been dumped twice and the guy had to break up with. I want to get married one day and have my own children I don’t want to be like 40 and get married and have kids that’s too late.