Personally no, did it for 8 years and I was fine, just had to keep super busy to avoid feeling lonely in the evenings and I prefer company tbh. Being with someone who understands comfortable silence or your own space is sometimes needed solves this for me. Also keeping busy as you get older can get a lot harder when you become less able to get out and about.
Sometimes a period of living by yourself can be cathartic, encourage you to push yourself and really helpful. Sometimes it can be lonely, depressing and make you become very single minded (in a bad way) and no longer able to compromise.
There's no right or wrong, no absolute once you decide to live alone / co-habit that must be you forever. Make the most of the positives in your circumstances (however small) - it helps. And it's never too late if you want to switch from one to the other.