Re: not alright being single. think again!
Others have rounded it up pretty well. Our (Desi) culture is messed up. Biraadri and relatives have a bigger say in an individual's life and decisions. Although it's changing slowly, but it still has a long way to go. The question parents worry about the most is what will others say? [Log kia kahen gey?]. WHO CARES what others might think, you can't screw your life to please others because you know what, no matter what you do, there will be somebody who is not going to be happy with your decision. So, one should keep other people's wish and happiness in mind as well but always do what's best for him/her in the long run.
Having said that, you shouldn't tell them straight up that it's your life and you have the right to do whatever you want. Although it's true, but there are a bit nicer ways to convey the same message. For example, like someone said you can have a professional job to support yourself. Money shuts everyone's mouth. Once you have money, you automatically gain confidence. Once you have confidence, you have the power to make decisions without being confused. So if you have enough education that can get you a professional job (i.e. office type 9-5 weekends off), you have a reason to put off your wedding saying you are focusing on your career and marriage is not on the top of your list of priorities.
If you want to look at it from a religious point of view: education, job, career, all that is fine, but one should try to get married as soon as you can support your wife or household, unless you have other valid reason to delay it, such as wife is still in school, family or financial problems etc.