I had the youth you describe: Found faith at 16, celibate until marriage, didn't drink, do drugs, go clubbing, etc.
I got married at 22, first child at 26, 2 more by 29. Life changed again at 29, when DD1 was diagnosed with SN (goes to special school). I was depressed, I think, for a while. 3 children under 3.6, DD1 was very hard to manage. Many times I had to abandon DD2 with someone so I could run after DD1 who was escaping....it was awful. Once DD3 was here, I couldn't take them all out on my own. DD1 just needed so much supervision that I'd find myself having to choose between whether i protected her or DD2/DD3. I had to give up my career and lose my professional registration.
I know it may seem insensitive to be describing life with children, but I suppose what I'm saying is that no matter what your life looks like from the outside, it can be hard on the inside.
What turned things around for me was that I decided that if this was going to be life, I'd make the most of it. I volunteered left, right and centre. Over the last 8 years I have been a preschool committee member/chair, chair of a children's centre partnership board, a governor and now chair of governors, I sat on admissions appeals panels, and was part of a special local authority committee as a special school representative.
You say you don't have time to volunteer. I don't believe you. You could choose to give some time to something.
My good friend was very, very single. She was heartbroken that she would never be a mother. She'd even had a prophecy given to her that she would be a mother to the motherless. One day, she went to a singles event at a church. She came away having had a nice day but knowing that nothing had happened. She was quite a lively character and I remember cringing when I heard that she'd done star jumps in the lunch break (I am an introvert!). But, a man was there who saw an energetic, fun loving, outgoing woman, who didn't take herself too seriously. He contacted her through a note given to a church leader who knew of someone from our church, who knew her. They met, we're completely bowled over with each other and she is a wonderful mother to his two children (bereaved). Life can change in an instant.