Oh, not that kind of element? Gotcha gotcha.
Well, I really had to give this some thought before I came up with a rant but here it is:
I'd say that soil or earth would be the most fitting element to describe me. Firstly, there's many different ingredients that make me to who I am and even though I have some very obvious traits there's also many things that aren't obvious at all, hidden among the sand and gravel. Things that only a very serious research could manage to reveal. I consist of gold as well as granite and my ingredients can be quite the contrast to one another. A lot of ingredients that I'm not proud of.
I tend to place myself below other people and allow them to walk on me in order to bring themselves forward. I can appear cold, ugly and resistant in my most basic state towards people but if I'm allowed to grow a little in their presence I can be very colorful, soft, warm and a reliable friend to relax with. I can provide (crops), entertain (flowers), and support (roads) depending on what is required of me and how I'm treated. While I'm fundamentally consistent, I'm also very adaptable except for a few core values. You could build a mountain with me, you could make sculpture with me but you couldn't turn me into water or put me on fire. You basically couldn't turn me into something I'm not.
If I notice that you don't feel much else for me than something to stomp upon, I'd simply stiffen and be even more reserved and cold. Though let's say that you poured water on me and tried to make me loosen up for the sake of me to grow, you'd find that your foot would meet no resistance once you stomp at it but with a result that it would leave a visible wound in the otherwise so sturdy earth. A wound that might take a while to heal without water.
Someone that would like to go past the green barricade of softness and really find out what's below the surface would have to dig, and dig deep. For a long time they'd only find the same kind of earth that lays on the surface, they'd get their hands dirty, they'd be sweaty and perhaps feel like their digging is nothing but hard work without profit but then at some point they might stumble upon something in the dirt that is otherwise impossible to see.
And as a final I have to say that earth and I have a similar way to comprehend negative emotions. Then I, of course, mean that old leaves and such is the earth's negative emotions. It often takes some time before we finally decide to get a hold of it and then we take it inside and slowly let it decay over time. We take it in, make it a part of ourselves and then we know it's in there but not exactly where. Then it can, in my case, sometimes resurface and make me sad but I often don't know exactly why I'm sad and couldn't explain it if I was asked about.
See, weren't that deep and cozy?
TL:DR: I'm the earth