It's not a hurtful issue to you.
Many people like to be single and late marriage nowadays. Because they can enjoy more singleton' privilage and they can devote more in their career.
You see when a couple they married, they need to adapt each other and their relatives, they need to plan to have a baby, they need to accompany with the partner for some social function, they need to aware the partner's emotion and any ex or some other love affairs outside themselves.
So do not be jealous to them, 30 years old is too young nowadays. Mandy people get married at their late 30 and early 40. Enjoy your singleton time.
All around me are single and they do not feel the need to marry.