My goodness, I'm the exact same way in a very similar relationship (I'm INFJ, he's INTP).

Just like you, I crave adventure. I love learning and exploring. And most of all, I love getting excited about all those things! I'm a bit ADD and messy, but at the heart of it I'm abitious and never want to stop.

My bf, on the other hand, might be excited about things but it's hard to tell because unlike me, he doesn't go on lengthy monologues about how much he loves X or Y.

I often get depressed because he doesn't seem to reflect my enthusiasms nearly as much as I do. I'm always the one to instigate date activities, try new things, pretty anything other than sit in our apartment. I miss my friends who would get as crazy and revved up as I would.

Seems like couples counseling is the dominant answer here, and I have wondered about bringing him into therapy with me. I'm not sure if he'd be willing to go, or if he'll change... I sometimes wonder if I'm with the wrong person, or if he can change.

One benefit about dating someone more "logical" than you is that they can reel you back in if you get a little "too" excited about something, e.g., maybe they'll prevent you from buying an expensive hobby item, or remind you to hold your tongue when it would be unwise to speak. Unfortunately, as INFJs, we really hate having our dreams held back, so this might be more of a conflict than a benefit...

I'm trying to work on communication, too. Maybe it would help if you explained how you felt and how that affects how much you can enjoy time spent with him. Try to use "I" statements, and maybe admit that while being emotional all of the time isn't perfect, you driven by gut-feelings, and to smother those is to restrict who you truly are. Perhaps it would also be helpful to give specific examples as to how he could be more in touch with his emotions. You two could try mindfulness together, plan a weekly adventure, or spark a conversation about a common interest of yours.

As to your last question... I struggle with that one a lot. You're engaged, and my bf has moved across states to be with me. To suggest that they aren't "the one" is a terrifying thought, but one I've been giving more consideration lately. Is it worth it to compromise who you are just to be someone who may not be the one? Or is your relationship worth putting that effort into? I've made the mistake of not addressing "red flags" in my relationship because I was trying to accept my partner for who he is, and now I'm regretting it deeply. I hope you find a way to communicate your feelings before they build up into resentment.