I'm glad I stuck with this past the opening, which was giving some rather culty vibes, something about the introductions was rather off putting in that sense.
However, Stop Fixing Yourself gives a lot of food for thought, but I don't think you should be consuming it if you're desperately seeking something, as with any book which proports to have 'simple' answers and poses many questions as rhetorical and answers other for you, you should go into it actively reading and with your critical analysis skills firmly on.
That's not to say I believe de Mello is trying to mislead, but this is the type of content a more sinister person could, and indeed has, used in the past to convince people that the key to happiness is to abandon all worldly goods and come labour on their commune.
I particularly liked and found meaning in de Mello's description of what happiness actually is as opposed to what we, and society, in general believe it to be, it was a novel concept and good for thought.
He lost me however at the notion of giving love to all and how their actions and how you feel towards them are really your perceptions caused by labels you have applied to them. I understand his point, and in certain cases he is correct, however it can be dangerous and unsafe if applied to people who are essentially toxic for you (I know, a label I shouldn't be using) this gives room for their abuse to continue, none of which is conductive to growth.
Thoughts on the "me" and "I" were intriguing, and I think there is some truth to his idea of "being", such as accepting a state of depression is happening, but not characterising yourself as a depressed person (although I've likely just butchered that idea there), but again, such simplistic ideas actually require much critical thinking and engagement from the reader, it can't be just as simple as viewing, accepting and throwing your anti-depressants away.
All in all, this is well worth a read and poses some intriguing, useful, and thought provoking ideas, just ensure you're in the right frame of mind to do so, and not being coerced by a third party attempting to indoctrinate you by using these teachings here for their own ends.