It's a cliche question. So it gets cliche answers.
- I don't believe in nihilism.
- I have long wondered why there are not more hard solipsists.
- Sometimes you all go away but I'm always right here.
Nihilistic skepticism is self defeating. If you deny the evidence at hand then you are lost. Yes it's an ad baculum. But it's a very LARGE baculum. The best we can do is the best we can do. If you deny the evidence then the best you can do is paralysis. This becomes very unpleasant very fast.
Hard solipsism is the claim that all there is is my own mind. If that's the case then there aren't any other people. So wondering about other people is without boots. And so, another baculum comes after us indicating that hard solipsism means we can't have friends.
Or, to put it another way, Descartes's "evil genius" cannot be refuted. But it's "the only game in town." If you don't bet you can't win. It's an idea that you cannot do anything with. Surmising that you are in the hands of an Evil Genius who supplies all of your experiential inputs does not allow you to make any different choices to what we experience. We are pretty much forced to ignore it and go on as though what we see is reality.
Personhood is directly experienced. One example of this experience is the fact that you can distinguish between you and everybody else by the fact that you are the one doing the attempt. And sometimes you don't see anybody else around.
These questions are all beaten to death many many times. You are not likely to come up with new answers that are any more satisfying or convincing. Go get Plato, Aristotle, and Descartes and have a good read. Then watch the movie The Matrix and just enjoy. "He's beginning to believe." Keep watching for the glitches. But do the stuff you are supposed to be doing according to if it is all really as you seem to experience.