If you aren't happy being single you will never be happy in a relationship. Get your own life first, then share it.
Knowing who you are deep down, the things in life that you are passionate about, and the dreams that you want to see realized, is huge in ever being in and maintaining a happy relationship. Sometimes we become single so that we can be able to get our own lives first. Some have found some happiness before they have found someone else, so this isn't always entirely true. But if you are single right now, be sure to examine yourself first, and to get your own life.