If you have low self-esteem, you are aware of it and you want to work on it, it is nort unusual that you try hard to be positive but you don´t think it works and you feel even more hopelessness. If you recognize yourself in this remember that you can´t just ”think” good things about yourself and at the same time ”do” negative things towards yourself. Examples are that you talk low about yourself in fron of others, you avoid going out because you think nobody will like you, you avoid buying clothes because you want to wait until you reach the perfects weight etc.
In other words you need to do good things (in the long run, so I don´t include drinking for example even if it makes you more relaxed in the short run) towards yourself at the same time as you try to think caring thoughts about yourself. Finally, after a long time the feelings will adapt to this and you will ”feel” nice things about yourself.
Cognitive Behavior Psychologist Monica Emanell