Centripetal and centrifugal forces

1. The problem statement, all variables and given/known data
A space station is connected to a box(50kg) with a super strong string(1m) and it is rotating which makes the box rotate at a speed of 10m/s.
I am inside the box.
Find the force the box exerts on me.

2. Relevant equations
##F=m\frac{v^2}{r}##

3. The attempt at a solution
I found that centripetal force=5000N.
This force is exerted on the box by the string.
According to my experience,the "me" in the box would try to move opposite to the centripetal force direction but I heard that centrifugal force is not a real force.
So is the force exerted on me 5000N or something else?Can you explain why newton’s third law does not apply here?

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