You do not have only one element. You find the one that you can work easiest with. I suggest working with them all and see which one works easiest for you.
Actually, the idea that you have an Element isn't correct. It's something that Hollywood dreamed up in the movie, The Craft, and someone people latched onto it and it won't go away.
We are not one Element, we are composed of all of the Elements. What we truly want to do is learn to work with all of them in balance. It is true that you may find that one or two of the Elements are initially easier to work with. That isn't because they are "your Elements" but because you need to spend more time and effort learning to work with the others that are more difficult for you.
Nor is it true that "your Element" is the Element of the Sign of the Zodiac in which you were born. Anyone who does astrology can tell you that your birth sign is only a portion of what influences your life. Which Houses the other planets fall in also has great influence. Take myself for instance, I was born in Taurus, which is an Earth sign. But I also have planets that fall under Water, Air, and a lot in Fire. So again...I am not one Element only.
Which Elements you work with also depends in part on which forms of magic you practice. The classic Elements in Western magic are Earth, Air, Wind, and Fire. Some also add the Element of Spirit to that. In Chinese astrology and magic the Elements are Metal, Water, Wood, Fire and Earth. That's why it is important to understand what you want to work with and in which system you are working because it changes the perceptions regarding the Elements.
There is no such thing as "my element". That is a concept from TV, movies, and fantasy novels. Those are great forms of entertainment but they are not a valid way of learning anything about magic.
You do not have one specific element. You might have an affinity for one element over the others, but that's all. If that makes you want to work with that element more than any other, then do so. But that does *not* mean that you have no connection to the other elements.
Remember, magic is not an inherent power. It is a skill, like anything else. Certain people have a talent for it, just like people have talents for music, art, athletics, math, languages, etc. But that's all. Apply the same logical and critical thinking to your magic that you would apply to anything else. If you were good at math, for instance, you wouldn't spend time and effort looking for "your function" and trying to decide if you should add, subtract, multiply, or divide. You would learn them all, even though you might enjoy one over the others. It is exactly the same with magic.