"While I do believe in the non-existence of Aliens"
This is not true skepticism - this is a positive claim that our planet is so amazingly special that it is the only one out of the entire universe that is capable of supporting the conditions needed for life to pop up.
To believe earth is the only planet in the entire universe on which life could evolve is quite an extraordinary belief indeed and this is not a belief that a true skeptic would hold.
Note that this is a different concept from alien life existing and that alien life visiting earth.
My own view is that alien life almost certainly exists somewhere else simply because I do NOT believe our planet is so amazingly unique - but I also believe that it's so distant that we will never make contact. It's entirely possible whole civilisations sprouted up and died out long before we appeared on earth, meaning that we have to consider both spatial and temporal distance.
Put simply: the true skeptical position is that aliens almost certainly exist (and if not, give me proof that earth is the only planet that could ever support life and another earth-like planet does not exist anywhere - that's a HUGE claim) but we won't ever make contact.