I agree with you on #2: going to the gym and traveling to work on my hobby (travel for rock climbing) has helped me feel a lot better in the moment, but ultimately feels like I'm putting off what's actually bothering me.

My diet is good already, but I feel like I should relax it a little bit (more social drinking, maybe a little more junkfood) as it will help me be less pre-planned and more free-flowing and social. I consider myself introverted (as many guessed and seemed clear), but am not stereotypically introverted: I have many close friends and don't have ridiculous anxiety attacks when meeting people. (Sometimes I do though).