Do I need to ground my generator?

I have connected it to my main panel via 50 amp inlet and breaker
Translation: I an a DANGEROUS MORON.

What you need to do is DISCONNECT and DESTROY the "suicide cable" you used to connect the generator to house wiring. Then hire someone with a CLUE to explain to you why if you want to tie into permanent wiring, your FIRST step is to replace the generator with one designed to be HARDWIRED through a transfer switch.

Note: There is literally NO SUCH THING as a 50 amp, or ANY amp, 'inlet' to the panel. Even if your main breaker is 50 amp, small by today's standards, that term is PROOF you are 100% unqualified to replace a light switch, much less screw around with the main panel.

What is clear is YOU DON'T HAVE a basic understanding of either electricity OR English. I have a grip. YOU need therapy.

50 amps - thats a huge portable generator
I connected mine, with an interlock but its only 30 amp
I never put a ground to the generator, I haven’t had a problem during outages
I used an RV outlet to feed the main and a 30 amp rated extension cord to go between the two
I did clear a spot and put patio pavers down where the generator goes because the heat from the motor killed the grass