What if I don't know what I want to do?

That presents a problem for you. If you don't know what you want to do, how does anyone else. Part of your search preparation needs to include you figuring this problem out and being definite about your future. There are numerous books that can assist you and plenty of classes that can lend guidance for you. Check your local libraries and/or local colleges. In your travels talk with friends and clarify in your mind what you like  and what you are good at. 

Remember it is better to be unemployed than to take a job you really don't like. Eventually you will be right back where you started and wonder what went wrong.