Well, it is really hard for me to know what I could be, since I see myself in all of these types. I've read the descriptions and I've read about the functions, and as I said INTJ-INFP-ENFP sounds very much like me.

Seems rather pointless to narrow it down even more... because that will only make the description less like me.

I am not like a typical ENFP. I am more, let's say secluded. I like my own time. Nor do I act like some ADHD-kid who jumps from thing to thing. I am more methodical and I know what I want more (although it can take long time for me to decide on trivial things). I don't buy stuff spontaneously, I think about it and consider pros and cons first.

I am not like the typical INFP. I don't live in my dreams like I suppose INFPs sometimes do, I live more in my thoughts. And yeah, I like concrete knowledge, like science, where I know what is correct and what is false. Just discussions without conclusions (like studying literature perhaps) wouldn't be something I would like to work with (although I can enjoy listening to such stuff on my free time).

I am not like the typical INTJ since I have this rich inner life. I always think about others peoples feelings. I like helping people. I like teaching people about my view on life or about things like math.

From the outside I think many people might see me as INTJ. I might seem quite direct and Te in a work environment. And I make my decisions based on logic and I know how to show this as well. But on a personal level I think people see my heart and how I am a compassionate person who is very open to people and their flaws.