Well, statistically and evidentially, yes.
Statistically, there are thousands and billions of galaxies, each consisting of billions of stars, and each star generally has at least one orbiting planet, it is highly likely some form of extraterrestrial life exists out there.
Evidentially, we have seen plumes of gas coming from moons around Saturn, suggesting a warm liquid ocean underneath a sheet of ice, a good place to look.
However, and I don’t mean to burst your bubble, but to date no evidence of life anywhere else but here on Earth has ever been found. We have not even found a fossil of a microbe on a meteorite. Nada.
We believe life is out there, but we have no proof to date that life has developed anywhere in the universe other than Earth.