I'm scared because price Bitcoin down, I do not know what to do with Bitcoin at this time

if you are already scared just because of a simple correction then you are missing the point of investment. you should know as first thing, that any investment is risky and you may lose money. in case of bitcoin this risk is a bit higher.
now about the price. it went up from $780 to $1160 in a very short period, and it needed to be corrected, it did by coming down to $950. looking at a bigger picture it is a $170 rise, take that and call it a win.