you can't consider it practice if its affecting your life negatively. if you truly think you have an addiction to playing videogames then you should cut out competitive gaming from your life. when you think that you have an obligation to play due to having teammates it gives you a very easy excuse to not stop. you're posting on an alt, probably because you're a weeb but not accepting your problem will not make it go away any faster
it sounds from your post that you're not addicted to videogames, but you're addicted to the escapism of them, because you don't have to deal with the problems in your life while playing. posting on an alt lets you escape your problems even moreso
if your problems are really being caused by an addiction to videogames, then cut out competitive gaming and don't consider videogames something to "practice" as a start to working on getting over it
but if its escapsim then you have to fix the root problems in your life. you don't go to school and play tf2 instead, are you not going to school because you can't help but play tf2, or are you not going because of the general malaise you feel about having to go?
i had something similar where i was playing up to 16 hours of tf2 a day and i was telling mysel fthat i was addicted to videogames, when in reality it was a way for me to run from the problems in my life.
if you want to stop feeling this way the first step is understanding and accepting what the actual causes of it are