Thank you @quit and @Blue. Your comments really helped and I have been mulling them over all week.
What you said, @Blue, really hit me hard. I really appreciate the hard talk and it got me thinking. When have I in my life every really taken responsibility for anything at all? I don't think ever, to be honest.
I can hazard a guess as to why I might have developed this way. I am an only child with a mother who was extremely overbearing. She used to push me but never let me take responsibility for my own agency (i.e. doing my music practice of my own volition). As a result, I began to find it more fun to bunk off and rebel than take responsibility for doing my music practice/homework etc. Basically, I discovered quite young that it was extremely fun and exciting to not do what I was supposed to. I never took responsibility for bettering myself, because my mum always did it for me, and my dad himself takes no responsibility for anything either so I couldn't learn it off him. I never learnt how to take responsibility, and I still don't know how.
I spent the last few days on and off viewing P subs and PMO'ing. I wasn't taking responsibility, despite having read your comment, Blue, and having understood that it is all true. It's like as soon as I do something I'm not supposed to, I feel free, whereas when I do the stuff I'm supposed to do, I feel trapped. That's why I can never stick to a structure and why it's so much easier for me to be disorganised than organised. Then, though, when I don't do the stuff I was supposed to do, it make me feel really guilty, which leads to self hate, which leads to more shirking of responsibility by disappearing back into the abyss of doing things I'm not supposed to.
I had a chat with my wife last night about it after I couldn't get it up with her when we went to have sex. I don't even know what it looks like to take responsibility for my own agency. I have no clue where to start. As soon as I begin to take responsibility I realise I'm a lazy, selfish arsehole, and that just makes me hate myself, which makes me depressed, which leads me to feel suicidal, which leads me to relapse. There's a huge disconnect. It might sound crazy that I've got this far in life having never really taken responsibility for anything but somehow it has felt like I have coasted by and been very lucky. I never did that well in school. Never took responsibility, just coasted by and got pretty much straight B's. Without wishing to sound arrogant, but my talent, looks, intelligence, and charisma have meant that people throughout my life have helped me out a lot, often without my asking. All the while, though, I have never ever really taken responsibility for anything. Life has presented and continues to present a myriad of opportunities but because I don't take responsibility, I have passed up on many of them, choosing instead to flounder and procrastinate.
Perfectionism has been a big issue for me, but I believe I have worked through a lot of that. I will revisit some of those booklets that my old therapist gave me, though, if I can find them.
Maybe someone can shed some light on taking responsibility? I think this is a huge one in terms of my recovery and general personal development. I can't believe it took me this long to realise it! I won't say Eureka just yet, but it feels like this could be momentous, if I can learn how to take responsibility for my own agency. The questions in summary: How to take responsibility for your actions whilst not hating yourself for all your failures as a person and descending back into addiction?