No, deciding to stay unmarried is not a bad decision. But this decision can lead to something bad. Every adult has physical needs. You have to fulfill that. You cannot deny that. If you say that I don't have that feeling, that means something is wrong with you. You have to go to the doctor.
If you are married, you can fulfill your desire in a way that society accepts in all countries. You can have a family, and kids. You can be a father or mother. This is how, you can contribute to your society. Don't you want to contribute to the society?
If you make a decision to stay unmarried, that is not natural. You are doing something against nature unless you have issues. Yes, you can fulfill your desire staying unmarried, but most society does not accept that.
We are social being. We love to keep in touch with people. You need someone who loves you and is always there for you. If you are married, your spouse will be always there for you. That will make you happy. At least you have someone who cares about you, your feelings and emotion.
It is up to you whether you stay unmarried or not. The bottom line is, this is your life. Do what you like. Do what makes you happy as long as it does not hurt anyone.