I have hand shaking problems since I was 14?

I am an almost 18 years old boy and my hands shake. Approximately I have hand shaking problems since I was 14.
I am nervous usually.
My hands shake all the time during any activity I make: for exemple: during eating, when I hold something in my hand or when I just lay on my bed. When I do something in front of someone my hands start to shake much more harder.
I think it is normal if your hands shake when you are nervous, but my hands shake everytime and it’s not normal.
It is important to me, because I want to be a doctor, probably a phatologist and my hands are not allowed to shake for this profession.
I think it is a kind of neurological problem.
What could be it?..what kind of medicines could help me?
In 2014 I had diagnosed with parathyroid cyst, it was cured with punction/with the punction of the cyst. The removed liquid was watery and transparent-> parathyroid cyst.
I don’t have hypo- or hyperparathyroidism, my PTH and Ca levels are normal.
I take Vitamin-D for my bones.
My height is 155 cm (5 ft 1 in).
These problems are related to my hand tremors?
Will I grow taller?

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