I also had these thoughts and anxiety over the direction of my life. I think I was experiencing a quarter-life crisis. I just had a breakup in the middle of the covid-19, feeling so alone, couldn't travel anywhere even to local destinations due to travel restrictions and I have no idea when will everything go back to normal. A lot of realizations, from family to health and to what I really wanted to do in life, I am almost 30yrs old yet I haven't traveled to any countries. Thus, I traveled abroad when the travel restriction was set to loosen. I visited Singapore, Malaysia, and Thailand. I really had a great time and it was fulfilling. These are really good counties for first-time travelers. Though SG is quite expensive, Malaysia on the other hand compensates for it because, from accommodation to food, it's cheap. Though, I only stayed for a night then jumped to Thailand where I stayed for a week. You can opt to plan your itineraries alone or you can connect with a local guide for more confidence with your trip like https://gowithguide.com/thailand or be a spontaneous traveler which makes it exciting.
In your case about marriage and having kids, I think the right person will come at the right time. Since you go out, you'll meet someone eventually. Just keep on exploring, and get out of your comfort zone so you will not regret it.