I used to cut as a teenager. I had a few shards of obsidian rock (glass-like sharpness) that I used to cut my arms and legs. It was only ever a few cuts each time, and not very deep. I wasn't to the point (at that time) of trying to damage myself, I just needed the feeling of the sharp pain, the endorphins, and to watch the cuts heal over the days that followed.
In my later teen years, when things were really bad at home, I started burning my skin (hands, arms, legs, feet), or scratching through the skin til the point of bleeding. With those activities, it wasn't about the sensation, it was about the damage done. I would pick at the scabs instead of letting them heal, causing some scars that are still with me to this day (some 15 - 20 years later), while the cutting scars are completely gone (except for one on my ankle).
Haven't cut or burned (or scratched) in at least 12 years, although sometimes when things have gotten bad I've bitten myself for the pain sensation (but without breaking skin). Overall I'd consider myself totally over the self-harming behavior, as the biting doesn't cause any damage, and it's more of just a comfort thing than a coping mechanism. If that makes any sense.