I am favorable to your position, as I too have gone my entire life with the mindset that a significant other is not essential. Recently, however, I have been more generous to the possibility, and while I'd still wholeheartedly agree that you don't need someone else in your life, it might be something nice to have.
Almost no relationship profits in the long term. The divorce rate is more than 50%, and a majority of relationships never even make it so far. From the long term perspective, the outcome of any serious commitment seems bleak. Indeed, it may very well be.
Fortunately, however, human beings do not live in the long term, but in the short term instead. If you can find a person to make your day to day life a little happier, then there's no real reason not to be with them. It may not be permanent, but in the short term it can provide you with some comfort and happiness, and, even if does end, it can end peacefully. Ending a relationship is not always painful.
Of course, this is just something to keep in mind. I am not recommending your parents advice to you. I'm not telling you, "Go find yourself a nice girl." I'm merely implying that you should not close yourself off to the idea if said "nice girl" presents herself. I do understand and agree, however, that it is far simpler and more convenient to live an isolated life, and there is far less hassle to deal with.
In the end, it depends on you. If you are comfortable with where you are, and you do not feel that any romance would help your position, then far be it for me or anyone else to tell you otherwise. All I suggest is that you not limit yourself if there does come a point where you find someone that makes you happy.
