Yes and No.
But, unless proven, the scale is on to 'No'.
If you bring proofs then I am the first to believe it. Till then, no.
My view is solipsistic, but I go with the evidence, which says that nothing has been found so far. 60 years of SETI and nothing so far. Some say "Absence of evidence is not evidence of absence". But okay, you gotta bring the evidence. That's how science and epistemology works. Based on hard pure evidence and not on 'gut feeling'.
Okay we estimate that there are 1 septillion planets, (10^24) but I repeat, nothing has been found.
With the amount of planets that exist the odds are astronomically small that there are no other living creatures out there. I'm going to say yes to aliens existing.