Do you believe in the possibility of life from other solar systems?

It's hard to believe it I am personally convinced to the fact that we are not the one living in this never ending and extended universe, if your mind is tiny then i don't think if you can understand it. *For example, we can compare the universe to the ocean, if we use a water glass to take just a sample of it, does it mean that there's no fish in this ocean?* . Of course all of we already know the answer and there's no need for me to confirm it. According to this fact we can easily get convinced that we are not alone in this universe. At present there's no technology enough advanced that would let us reach other galaxies, so the chance to meet
those extraterrestrials. To end it up we can tell that we believe in life from other solar systems or galaxies different to ours.