So this has been a constant in my life. I fixate on a certain thing, figure it out 110%, take in every nuance of a system, etc. Then, I get incredibly bored with it and sometimes abandon it forever.



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A few examples:



Food: I will crave the same food for a month, and then not eat it for years. My current is pot roast. I can't seem to eat it enough. I'm glad it's high protein, low carb this time, unlike many of my cravings in the past, haha.



People: I have a tendency to attach wildly for a little while, but then get very bored. I have to fight my urges to binge on people. Taking things slowly, with small breaks between interaction generally helps me.



Games: If I find a game worthwhile, I will play it all day everyday until I have all but mastered it. I will read about the mechanics online, figure out exploits, and min/max my way to victory. Once I've got a game figured out, though, I very often just quit instantly. With finite games, I often get close to the end, and just never care about actually finishing it. The story doesn't really drive me in any game, it's all about game play and mechanics.



Studying: I will get SO into a subject for a week or two at a time. I will spend day and night reading and discussing the topic... and then I won't even think about it for months. These topics come and go over the years, though. Often returning when I am reminded of them randomly much further down the road.



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To me, this seems like your Ti running out of Se to use. Se takes in all the stimuli, and Ti grinds it through that crazy meatgrinder. Eventually you've already explored all those stimuli, and there's nothing left to analyze or figure out. Does anyone have a better explanation for this? And is it even commonplace for ISTPs? It really causes me to run into problems in life, because I really crush things quickly. If I get into something, I get into it fully. By the time my friends have warmed up to the idea or activity, I'm either too advanced in that activity for them to comfortably join me, or I've just abandoned it completely and have moved onto something novel.



What I've started trying to do, is just do everything at once. I'm trying to learn 6-8 different things at once, rather than focusing on a single thing. Mainly because I'm kinda sick of doing things in solitude. As I get older, my Fe is starting to shine through and I'm wanting more and more connection with people. This is also why I'm starting to think I'm ambiverted, but my 3 day rest-sessions after a day of extroversion are probably evidence that I'm not.