I just completed a flight this afternoon with my DJI Mini.
Like yourself, it is second hand, and really you should have done some research before flying it.
A quick search of youtube should have been your first port of call and a software reset. You can then register the drone with yourself.
The drone will pick up your location as the return to home point if you give it the 60 seconds to acquire the 15 or so satellites.
Its unfortunate what happened and easily avoidable.
I used to fly RC helicopters, and these had 1m diameter carbon fibre blades spinning around and were very scary. The Thunder Tiger Raptor 90 Nitro was the weapon of choice.
You must do your research as first principles.