it's a familiar pattern of behavior, and in my experience it's when i feel like I'm where i dont belong in life in general and the current environment or mood am at when that mood thing happens in particular . things i have found to work so far :- surround yourself with people you really like, get a real friend - if you feel this way when you are with your friend, then you need a real friend that can change ur mood away from blue. -get a pet. (if it's your thing) -"start some kind of note taking, it can be in the form of diary, just write what you feel and what do you think you can do about what you feel, what caused you to feel this way -work on your communicative skill - build your self-discipline, because when you feel like ignoring someone when you are feeling low, you will say hi because of self discipline whether you feel like it or not. - work on things that matter to you, like what do you want to accomplish in your life, are you living your life the way you want it ? -"try to control your emotions because in the long run it will have a negative effect., it might be hard to stop what you feel inside, but what you manifest in the outside like ignoring people, you can try to manage that. and that in turn will lift your mood a little. act happy and you will be happy ✌