Life on another planet

I think about this alot topic alot. It always crosses my mind; all the what-ifs. what if there's a planet of all water with underwater civilizations? there's so many questions I have about life on other planets. i totally believe that there is life out there. Earth is just one planet in the milky way galaxy, but what about the millions of other galaxies with the millions of other plants in them... it'd be a shame if there wasn't at least one other planet with life on it.