I've become a totally different person since the beginning of 2014, but I'm still not there yet. Time to time, seems more often in winter, I hit this mental plateau where I go back being this low self-esteem person. After a day or two or a week I snap out of it, but I feel as if I hit a plateau then dropped ( in a mental level ), then go back up and hit around that plateau. Any advice ? I am 24 year old man.