Have you ever heard the line “It’s not what you know, it’s who you know”? Well, this applies to more situations than just getting a job. Who you associate with greatly affects your mindset.
Think about it for a moment. If the people you spend most of your time with complain for much of that time, then you are spending most of your time focusing on complaints. If you are interested in cooking, but you never spend any time with cooks or chefs, chances are you are going to have a tougher time finding opportunities to cook than a person who does. Or lets say that you want to focus on saving money and investing for your future. That is going to be hard if you hang out with a crowd that goes out and spends all their money at the bars every weekend.
I am not telling you to dump your friends, and stay away from your loved ones if they do not meld exactly with your goals. What I am saying is that if you have specific goals, getting to know a few new people who share those aspirations can only help you reach them.
Yet another reason to know what you want: so that you can meet others who want the same.