There is most definitely not more pressure to be in a relationship today than in the past. You kidding me? Imagine being an unmarried 20 something in 1950? Lol
So be grateful for living today where according to stats more adults are single than ever before.
Now on to your situation specifically.....
Perhaps your friend group or family is pressuring you, of course that still happens. If so just tell them that you are happy as you are and all of their pressure is stressing you out. Or if you like blind dates tell them to stop telling you about it and send the options your way.
If you are pressuring yourself then that is a whole other problem that you need to resolve internally.
Noone can tell you if its better for you to be part of a couple and it certainly depends on who you select as well.
Either way stressing is bad so stop it. Decide what you truly want and try to make it happen or be satisfied with your situation but if you want to build a family in the future or get married, you do have to start somewhere. Being in a relationship can be the best or worst thing in the world so choose wisely.
And stop worrying.