Marriage isn't for everybody, and that's okay. As long as you aren't stringing partners along who are looking to get married when you already know that you aren't, then your choice doesn't seem to be hurting anybody.

I'm 35 and married. Sure, tastes change, but my wife and I chose good partners in each other; we won't hate each other or get irreparably sick of each other, we make a great team, and we understand each other's limitations and are mature enough to ask for help. We let each other in. There is security and stability in marriage. I'm not great at meeting new people, so not having to go on another first date again is a huge relief for me. Making a good first impression is fucking exhausting. In contrast, I know how my wife is feeling pretty much just by glancing at her, and it's really fulfilling to be on the same wavelength as my partner like that, especially because we're also open communicators who can share the honest, fucked up feelings without worrying about judgment. So we're basically each other's therapist, but we share housework and meals and money, and we snuggle and kiss and fuck. I can understand that that's not appealing to everybody, but it's hard for me to imagine a version of myself who doesn't want this. But again, it's not for everybody, and it's perfectly okay to not want it for yourself.