my impulsivity has been ruining my life

I don’t know how to prevent myself from giving into my impulses every time, and then feeling insanely guilty afterwards so much that I want to disappear. Whether it be excessive money spending, doing attention-seeking things, cutting people off, deleting my social medias/profiles, etc. I cannot stop myself once I’ve “justified” the impulse (usually by saying, “I only live once so I might as well do [xyz]”) or I especially do it when I’m upset and feel the need to make a massive, sporadic change. Any helpful tips from others that deal with this? I’m in over $6k debt because of my impulsive spending and I’ve ruined relationships and friendships from how quickly I switch from being ‘normal’ to “needing a change” and sabotaging everything in my life.