When should you start worrying about marraige?


Do you even WANT to get married? If not, then don't worry about it. Just don't do it!
Who cares if everyone around you are getting married and having kids. If this is not your kind of thing, you don't do it. If family members are harassing you or pressuring you about it, tell them to fuck the fuck off!!

I do however detect that you are feeling lonely, but don't give up! Get out there and meet women (or men if that is how you roll) and have a good time!
You'll find someone eventually =)