Also not to be all "look at the bright side of things" type of person (I'm not really a chippery type of person)
I can understand that, 'cause I'm not an overly bright-chirpy type myself, though I think I'm definitely happier these days than I have been in the past. But I still often wonder "why me?" - we are all but human, there'd be something wrong with us if we DIDN'T think this at least some of the time!
I spent too much time worrying about pleasing the world around me and no time taking care of myself.
Oh my goodness, so did I! I can't tell you how much. When I decided to take care of myself - surprise, surprise, but some of those supposedly "good friends" melted away mighty quickly. It hurt badly for a long time, but eventually I accepted it. I don't need people like that.