As someone who has a lot of anger and self harms and has for a long time I completely understand wanting to see the blood and feel alive. For me, I do it to either numb myself from intense emotional distress or to feel something but there is always a lot of regret afterwards and the relief you get can be very short lived with very dangerous consequences and scars as a constant reminder of what you did. If you're willing to try a couple things, I have some ideas that I've used. Theres the less invasive things like holding an icecube and feeling it burn, coloring with a red marker where you would want to cut, sitting with two ice packs under your knees while sitting crossed legged, I tend to throw things and break them. If that doesn't work there are ways to feel pain and alive that are safer than cutting such as punching your thigh (the colors of the bruising is nice to watch over the days), some ppl will go get piercings or tattoos. If its the desire to see the blood, maybe finding videos online of like open heart surgery or something but help. And if ultimately you choose to cut i would encourage you to use a clean sterile object, choose an area on your body that is less dangerous of accidentally causing you to need medical attention and have supplies like bandaids, steristrips, and disinfectant ready. I really hope you can find some relief without self harming, but know that I understand.