I've never viewed getting or being married as a bother. I also don't think whether or not one feels young has anything to do with relationship status.
I'm married because my now-husband and I spent time talking about what we wanted for our future and those discussions led to discussing marriage. Same reason I have kids.
We weren't conservatives then nor are we conservatives now. We married as teenagers out of love and consideration of all the options before us. This is the one we wanted to have together.
Were either of us insecure? If I was insecure in my relationship then, I would not have married him then. While I've heard of people marrying to save a relationship, I genuinely do not understand what insecurity has to do with marriage or otherwise legally attaching yourself to another person. Even after discussing marriage and the future for months, I took a day to weigh pros and cons and different ways it could go when he proposed. I knew there were risks - I was a teenager, but I wasn't entirely foolish. I was as confident in that relationship as it was then and that choice as I think I could have been, and decades on, I view my decision to marry my husband as 100% the best choice I've ever made.
Do I view myself as superior to those unmarried in long term relationships? No. There are pros and cons either way. It's more important to be intentional and prepared for inevitable like death to protect one's loved ones than doing that one specific way.
Do I view it as an accomplishment to have been happily married for over 20 years and take some happiness and pride that I have a healthier marriage that outlasted those who taught me as a child that girls like me don't marry, shouldn't marry, shouldn't be dated, and a host of other vile things many disabled children to this day still sadly get told? Yes.