Finding your element takes abit of time and effort. But overall it is not very hard. Your goal is simply figuring out which element is the easiest for you–be it easiest to call, or easiest to work with. Here is the way to find that out.
Practice each element one at a time, making sure to write down/remember the details.
For water, simply get a glass of water and feel it, call to it and see how it connects to you and how well it works.
For air, you can use a feather or simply go outside in the wind. Listen to it, feel it, draw upon its energy and see how it responds to you.
For fire, get a candle and light it and pull at the flame and see how it responds.
For earth, go outside sit on the ground and feel it and see what you can feel and how well it responds to you.
One should be the easiest, and one will be very hard to work with. The other two being varying degrees of easy or hard.
You will suck with all the elements currently, but one will still be worlds easier to feel or work with right off the bat. That is your main element.
Like I said it is really quite simple but takes sometime and effort to figure it out. However once you do figure it out it can help you in many areas and paths in your life.
Hopefully this helps you figure out what you are. 🙂 Any questions or if you need help feel free to ask!