This is going to be a bit of a non-post since I struggle to articulate how, exactly, but psychotherapy changed my life.
(Disclaimer: I have a master's in Freudian psychoanalysis, so I went into therapy with a heap of expectations.)
I started therapy because I was depressed, and it was affecting everything. I hadn't been in the UK long, I had no idea what to do with myself after uni, no relationships (either close friendships or romantic), just general gloom.
Nothing changed overnight, but very slowly I felt I was able to think better and to make better decisions. I got a proper job. I moved home, twice. I met a first then, second BF (now husband). I realised that I was not responsible for my parents' dreadful mistakes. Perhaps most importantly, I learnt to enjoy myself, my company, and my life.
It was difficult to take the plunge, but I'm very glad I did.