why is it one or the other? There are mixed race and it doesn't mean they have to pick which race they belong to.
MBTI isn't necessarily based on inheritance (which you seem to think based on your other thread). It's about what sides you lean toward, based on how you think. If I find that I identify with INTJ I could attribute that to high Ni/Te, but that doesn't mean I'm an INTJ.
Not that it really matters, it's just a nice box to put yourself in so you have some foundation to work off of when trying to figure yourself out.. call yourself whatever you want
When I first took the personality test I couldn't tell if i was INTJ or INTP since they are very similar. what are the big difference between each other?
INTJs and INTPs are very different.
INTJs use abstract inner visions to decisively organize the outer world into new and useful applications. (If forced to choose, they will sacrifice internal consistency for expediency.)
INTPs observe abstract patterns and connections in the outer world to create internally consistent theoretical positions. (If forced to choose, they will sacrifice external applicability for internal consistency.)
If you could be anything you want, I bet you'd be disappointed--am I right?
Assess your cognitive function hierarchy. I've found that I operate slightly more like an ENTP than an INTP, yet I'm extremely introverted and this has no chance of changing. We're all a mixed bag indeed.
"Stop it, you fuck. Give him some butter."
Ti = Ne > Ni > Fi > Te > Se > Fe > Si INTP (I/PNT) 5w4
The fact that you are borderline for traits between the two type descriptions means that the use of questions about whether you look more INTP or INTJ in demeanour, or whether you favour application of theory, will be of somewhat limited use. They confused me no end when I didn't know what I was, because I relate to sizable parts of each (which was largely why I didn't know which I was in the first place).
If you want to work out which you are, I strongly recommend prioritising the different avenues people give you. Work out what it fundamentally means to be an INTJ or an INTP - whether it's fitting the description best, or fitting the cognitive functions best, or whatever - and then use that to determine which you are.
Because, if you're already unsure of your type, all of the 'telling signs' people will give you are likely to go in different directions, and only confuse you more. Whatever you settle on, you may have to accept that in significant ways, you'll be more similar to the other type. For example, I'm NiTeFi, which I take to mean INTJ, but I favour understanding and theoretical accuracy over practical usefulness any day.