Don't know really how to tell you this since it's a pretty complicated problem, I guess, so let me get on with it.

It's hard to tell what is wrong with my phone since there seems to be no lines on the screen because that's the symptoms of  'Touch IC Disease', it causes the touch screen to become unresponsive due to a logic board connection failure. This is a really common problem with the iPhone 6 and 6+, the chips in question are the U2402 Meson and Cumulus U2401 chips, which are the root of the problem. Apple did notice this and from what I researched they did have repairs for it for, about 150 bucks, but when they did refurbish it, they were still prone to the problems, plus its cheaper if you do it yourself.

So I am pretty sure this is the problem because there is a spot on the back of the phone were the chips. When this spot is pressed it can make the screen responsive, but forcing the chips down is a terrible solution and could even damage it too, it's just a pain to do anyway.

That's really all there is to it, now repairing from the looks of it seems difficult but not too hard. We have most of the tools, but you may need to buy some. Enoc bought a soldering kit, which is needed to do this. I don't think we have a heat gun but a hairdryer will also do the job, a small one tho. As I've actually looked into this stuff before, I don't know why but I've looked into all sorts of tech things but I guess it's since I am a tech-savvy person.

The video which I have found to help: https://www.youtube.com/watch?v=jq7COeOxC1g
There are more videos to help but this one seemed the most helpful.