I can't speak for the first two events, but you brought the last one upon yourself. Everybody knew you'd be fired from the GT for inactivity, and playing videogames is not a reasonable excuse to neglect a responsibility you have assumed.
In any case, do what you think is best for you. Maybe you're not ready to handle interaction with many people; after all TPM is much like the real world when it comes to that. Some will understand you, some won't, some will make fun of you, and all will expect you to act upon your word and do what you have offered yourself for. By leaving TPM, you're just running again from one place where you get to experience social interaction, but I hope you understand that you can't block it away for the rest of your life. It will catch up with you wherever you go, and you'll have to learn to deal with it some day. But maybe you need some time alone for now. I suggest you use it to reflect and get whatever help you need.