i did it for a while when i was 17..
i'm 26 now. i can look back and honestly say it was probably one of the dumbest things i've ever done. i didn't really get any sort of physical satisfaction from it. i suppose i just liked people feeling sorry for me when i did it. i'd waltz around the house in short sleeves, i'd want my parents to see. i'd brag about it at school, even at work, i'd take pictures of it and post it on internet forums, i just didn't care. i liked the attention, i liked people feeling sorry for me, i liked it when people saw me for what i felt i was, pathetic. there was never any suicidal intentions from it for me, granted i very much wanted to die, i knew it wasn't going to happen cutting sideways. there were days where i got so angry or anxious and i'd think i needed to cut, but i never truly needed to. it didn't stop the anxiety and my problems didn't go away. it did nothing. it was a temporary distraction to a temporary feeling.
but now of course, i'm 26, my arms are all scarred up and i can't explain it away. i have to wear long sleeves, even when it's 110 in the summer. i'm ashamed and embarrassed to have to show or admit that to anyone in person, and it's even harder to admit that to women i'm dating (i typically don't until i absolutely have to) i can't and never will be able to look someone in the eye and tell them honestly why i did it. i have to live, the rest of my life, with marked up arms because of a few poor decisions i made as a teenager.
if you're looking at those pictures thinking "i should do this" think again.
it's just a ridiculous fad people do and it needs to go away. cause one day, you'll be 26, you'll be in the real world with a real job and real responsibilities, and hell you might even have overcome depression. but you'll never have any confidence knowing what's beneath your shirt. there is absolutely no good reason to pick up cutting, ever. if you need an escape, find something else that won't be a lifetime decision.
now with that said,
that's just my own experience, and my only diagnosis is asperger's. i'm not going to speak for people who cut during meltdowns, or can't control their anger, or have other outlying mental illness issues - i don't know what it's like to be in that situation or how cutting can help (or not help) someone there. and i'm not going to speculate. i'm not here to shame anyone for what they're currently doing, i'm only trying to convince more people to not do it. so no flame me pls

I second your notion that it is not something anyone should consider. At all. It's not an answer. I personally did not mean to present it as one if I did.
I am not embarrassed by it however. I wear short sleeves and shorts (I did quite a few deep cuts on my legs too) and if someone asks me I'll tell them. I really don't care what they think because they haven't walked in my shoes. I can respect why someone would be embarrassed about it, so I'm not knocking you for saying that, or anything here. I guess more encouraging you to not be embarrassed because the people who may be judging you most likely have no idea what it's like to have the same issues as you. We all experience things in life, make good and bad decisions and we have to live with them.
If all of our worst decisions were visible on our flesh we'd all have a lot to be embarrassed about.