It hurts

In the end I developed RSI. I only do 2 thing in my life

  - Fapping
  - Programming

I truly wish it was caused by the second.

Now seriously it seems that my touch typing isn't the problem, it has to do more
with the mouse usage. Any technique or product I could use?

As a background during my teens I used to do a lot of BMX, so i was always
working my wrists, but in the last year i stopped that. could it be that a
cause?

I can't tell over the internet. Perhaps we could arrange a meetup so I could examine you more throughly?