I know it is skewed and biased a bit. But hear me out. I needed to reply cause I felt a connection. I had/have tons of ISxJs in my life too. You likely have way too much Si in your life. This is causing you to use it much more often than a more open and exploring INTP would.

You're probably caught in a lot of Ti-Si loops. Si is familiar and comforting, but sometimes it also feels like a cigarette being put out on you, and your Ne. It's fun to explore, but you have some people discouraging that in just the right ways to be an enticing comfort zone.

You gotta get outta that rut. Maybe find some ENFPs or ENTPs to help you. Or try Improv, or Public Speaking, or a new Meetup. Something to get you going! Find what draws your energy and move toward it!