Having a bit of an identity crisis?

well, like last year i was depressed. then i went through a period of being incredibly happy to incredibly low. and now everything is perfect. i'm now confident. i've realised who my real friends are, even if i don't have many. i'm surrounded by things i love. the weather is nice, its summer (wooo!) but it's like i don't really who i really am yet, like i don't know who i stand for. nowadays, if anyone gives me **** im not scared to start on them. but now i'm finding it hard to get the balance right between being a good person and not causing trouble and standing up for my self/friends and what i believe in. i don't really know where the line is between making things better and making things worse, i becoming more in touch with my dark side and i fear i may be becoming a bad person. i just don't wanna be walked all over - again. they say you don't lose friends over the years, you just realise who your real ones are. but i've lost so many people i counted as friends in these passed few months through sticking up for myself and others that i'm starting to doubt that. i wondering whether i should have just left it and kept all these people as friends and forgave them. BUT i've been doing that all my life. i'm now known to be someone who doesn't let people tread on me and sticks up for myself, who doesn't take **** from people. its a world away from who i was, a shy kind girl with a small group of friends. im like the opposite to who i was. but now i only respect people who respect me. i'm finding it difficult tbh. i've changed so much.. but for better, or for worse, i'm not sure? Help!