Absolutely. No shadow of a doubt that there is other life forms out there beyond our own solar system. And when you factor in our own planet is 4.5 billion years old, the Universe is said to be around 13.8 billion years old, and the observable Universe is estimated to be around 93 billion light years across, it would ridiculous to suggest that no other forms of life exist, and that this pale blue dot we call Planet Earth is the only source of life.
Now the statistical probability that we would ever come into contact with them is a different matter though. It would be like taking all the grains of sand in the world, laying them down on a flat surface so each grain of sand is individually laid on the surface (so no grains of sand stacking on top of each other), and then being able to find the one grain of sand that looks just like Earth. You think finding a needle in a haystack is hard enough, this is magnitudes more difficult.
But I'm being too easy here. There are estimated to be around 7.5x10^18 grains of sand, or 7 Quintillion, 500 quadrillion on Earth. There are a lot more stars in our observable universe than that...a LOT more. And then imagine if each one of those stars has multiple planets surrounding them. You can imagine just how unlikely it would be for us to even discover life forms on other planets besides our own. Now, you can increase our chances if we only focus on the Milky Way with its estimated 100 billion stars, but it's still very slim chance.
But again, I have no doubt other life exists in different parts of our own Galaxy and the rest of the Universe. It used to be that we were the center of everything. And then we discover we are part of a solar system filled with lots of planets and satellites surrounding it. And then we discover that solar system is part of a massive galaxy, and that massive galaxy is part of a cluster of other galaxy buddies. It's not that we are only small, it could be...we really don't matter.
Sorry, I can get carried away about space.