If you mean that little spark of something in us that comes from the great infinite life force which exists outwith time and space and can not by any measure be analysed or quantified as being part of the material matrix in which we live our lives.....
.....then I am in absolutely no doubt whatsoever that the soul exists.
If you mean something inside you that is both sacred and that the you, the I, the ego, somehow has exclusive ownership over and gets to keep hold off, then I am not so sure.........but when it comes right down to the wire, that won't really matter. When the ego 100% fully submits to 'god', which will happen to most when they die, then the soul detaches itself from the ego and immerses itself in god and that happens because the soul is just a part of god.
I don't think this is possible. If you have no self then you cease to exist. I think even God cannot exist unless he is observed either by others or himself.
So I think there is an essential separateness, which I call the self (or now soul) between the experience and the experiencer.
What I am now thinking of as a soul is just a stronger more independent version of the self or the homunculus in the brain that is subject to experience. The puzzle in theories of perception and cognition is who is having experiences and reporting them and theories often end up having a hidden homunculus. (Or homunculi as in the numskulls cartoon below)
Many years of serious martial arts training under the right instructors allows you to explore so much more of your mind that most people even know exists.
However, the concept of soul is misunderstood by most people so they get it wrong.
As for what happens to your soul after death, that's very much under debate, but its existence is only denied by the narrow minded.