Actually I don't know for sure leh. There are some times in life where simple simple things can cause me to suffer from anxiety attacks, and there are also instances when I worry because of fear of missing out (FOMO). I do think substantially, but that's to help me preempt problems before they arise in life. I'm not sure whether does that qualify me as a "person who thinks a lot".
I am a diagnosed siao lang with IMH hospitalisation history la.
Something I use a lot on most days, is not thinking or worrying, instead what I call it is "intuition" or "instinct". It's a Scorpio thing, we tend to brood a lot, but when it comes to decision making we rely on "intuition", it's a water element trait. It doesn't mean that I don't worry and don't fear, but instead as my American Zen roshi taught me approximately, "Sometimes we are like our own parents who love to spank ourselves on the fanny. Still, there is one thing that every caring parent knows, and it's the fact that when we bring caring intellect, emotion and attention to bear, right and wrong are set aside."
I worry, I fret, I feel anxious and I fear, but when I put all my mindfulness and awareness to the situation at hand, I am no longer strangled by the views of correctness or wrongness.
Sorry for being long winded, it's been a tense couple of hours for me this Sunday. Had to let go of some stress along the way.
… Even those rich people also worry a lot eg.. worry no health to spend their wealth… worry their spouse will has affairs… worry their kids will take drugs. 
