Why is that most people in my age range are getting engaged, married or having kids?

Don’t get me wrong I’m very happy for them I I feel like I’m not going anywhere in my life. One of my friends is engaged and is getting married next year. I am of course happy for her but my best friend is like, “It seems like everyone is getting engaged but me!” I know she was kidding and is happy for her too. Anyways she is 27 like I am. Some people I know have kids or getting married. One girl I knew from high school got married last year and she was 26. My other friend he is 37 and finally getting married. He has a daughter who is 3. My second older brother is getting married later this year and he’s 30. My boyfriend well ex boyfriend dumped me for another girl. Now I’m 27, single and hopelessly in love. Every relationship I have just never works out. I got dumped three times because they found out I have autism.....well have Asperger’s Syndrome. 😔😔
My ex and I were together for three months.