Many thanks for your question. I can however sense some confusion in it. Let us get one thing clear. We do not know what is a negative charge and a positive charge. The early scientists gave electrons a negative charge and protons a positive charge. They knew that they (electrons and protons) were different …and that they were attracted to each other. Work by early scientists had shown that you could create two different types of electrical charge and they were attracted to each other. Thus the positive and negative nomenclature.
When the nucleus of the atomic particle was investigated they found that it contained particles that were attracted to the smaller particles surrounding the nucleus and they became protons surrounded by electrons. They also found that these particles had opposite electrical charges. They designated the positive charge to protons and the negative charge to electrons.
In some cases the small particles (electrons) can be made to carry a positive charge and they become ‘cations’. You will not however find them near the positively charged nucleus of an atom …they would be repelled.
I hope this helps……