Although I can feel this is something that pains you, but I am sorry to say that you are being ignorant of facts and reality of life. You cannot take the view that this is what I want and that is all that matters, its just not right, it has to be based on some sound reasoning's.
@saiyan0321 and
@AgNoStiC MuSliM have presented different kinds of valid arguments, but you seem to be repeating yourself. For example, I cannot take a view that I can have sex with any women I want because I am stronger, or I can kill anyone if I believe they have killed someone I know. The fact is, as civilised beings, we live in a world according to rules and the rules change with time and conditions applicable to a situation. You have been provided a legalistic argument, a logical argument, an emotional argument and a social argument, I would say that is fair, you have to come back with something better then, that is what I want.
You are already aware the people of KPK made a choice for Pakistan and continue to do so, I know some personally who would kill me for saying anything negative about our country, although on the face of it you couldn't call them openly patriotic.
I am going to try and expand this discussion just a bit further. The situation you are describing has always existed, because in history empires never followed ethnic lines, ruler had his kingdom and that is the area he controlled. Because there were no border controls until the adaptation of a "Nation State", the people were free to go as they please. Now, you, I and we live in a world governed by "Nation States" so we must live by rules that apply to modern governance.
I can give endless examples, but I will stick with Afghanistan,
You have Tajiks, are they free to come and go into Tajikistan?
You have Uzbeks, are they free to come and go into Uzbekistan?
You have Hazara with close links to Iran, are they free to come and go to Iran?
You have Baloch, are they free to come and go into Iran and Pakistan?
Cross border ethnicities exist all over the world, and most of them live peacefully because they accept the reality, and nothing can take away your identity. But open borders are possible only between states, not regions. for open borders you need to have peace and brotherly relations.
You also need to recognise that millions and millions of Afghans, your brothers, reside all over Pakistan as refugees with unparalleled freedom, they have done so for 40 years because all the ethnic groups of Pakistan, not just people of KPK, the Punjabi, Kashmiri, Sindi, Saraiki, Balochi, all of them view Afghans as brothers and sisters, and accept them on their land for that very reason.
Look at the situation with reason and fair analysis and I am sure you will find a suitable answer, I cannot tell you what to feel, I can only present the reality on the ground and reality of life. I hope you find peace, I for one would be happy to see open border between our countries, where we can come and go freely, but for that to happen, proper steps need to be followed. Stay blessed.