Those who decided not to get married

Hello! I have seen a lot of Redditors mentioning that they are opting to stay unmarried for the rest of their lives. Now, we were brought up to think that marriage should be the natural next step at some point of life. Upto our previous generation, this was the norm. But, why so many young people are deciding to stay single? I would prefer the experience of those who are already 30+. No offense, but if you are still in your 20s and say that you have decided to stay single, I would say that, "You still have lot of variables which will change your mind young brother/sister."
So, those who already started the course of life as a single person, how did you design your life? What are you doing with it? How did you handle social pressure/family pressure regarding this? Why did you decide to live like this? I would appreciate whatever you can share about this.

P.S.- I am specially interested to know the perception of Women here. Partly because I am female, and partly because I have not seen many women who chose this lifestyle in Bangladesh.