Should I...punish myself for the fact I keep on screwing up?

Hi. New here, FtM (17), but not new to ADHD at all. Undiagnosed, but I am fully aware of myself displaying various symptoms ever since I was around, idk, 14. But, I feel like it kept on getting worse—Im procrastinating more (look at my username bc I named myself that to cope w this status), unable to keep track of time, and always obeying my impulses. Im just one step away from punishing myself and going like "no no fuck you why are you like this why do you keep on fucking up like this"

What do I do? I know I shouldnt be too hard on myself, but everything feels detrimental and the only thing barely working on me was making sure I feel shame just to *feel*.