What is the reason I am not married yet, while everyone my mother prays for to get married does, including my friends and neighbors?

Perhaps delaying marriage is better for you, for Allah Almighty ordains for His believing servants what is best for them. You may attain, after this delay, the greatest share and the most complete good. We advise you to fear Allah, to observe His obligations, and to stay away from His prohibitions. You should supplicate frequently, especially during times when prayers are answered, persevere in reciting the prescribed dhikr, and pursue legitimate means for marriage.