OK, you need to go through the following technique.
Fill the basin with water too hot to put your hands in (go on, be a man!) Soak a flannel in the water and hold it over your beard area - take a deep breah first, so you can stand the pain, and so you don't suffocate yourself. Wring out the flannel and repeat.
Now apply some 'sensitive' shaving gel with aloe vera, and spend at least to minutes working it into your bristles.
Shave very slowly, do not press on, let the blade do the work. Only shave in down strokes. use four fingers to feel which bits you have missed and gently go over them.
Fill the bowl with tepid water and rinse your face.
Dry by patting your face gently, don;t rub at all.
Apply a 'sensitive' moisturiser gently and not too much.
If you want to apply aftershave, but it on your forehead, your wrists, and in front of your armpits.
Only shave every two days, and shave before you go to bed, to give your skin chance to repair while you sleep.
Change your blade every two shaves, certainly no more than three.
Follow this regime and your skin will recover, and stay smooth.
Remember, our fathers used the old 'hot water and cold steel' regime and shaved with Bics like jam-spreaders, but they had beards like sandpaper, so that was fine.
Modern skin is more sensitive, you need to be gentle with it.
Good luck.