Nobody knows the answer to this question beyond a shadow of a doubt. Right now, with our current knowledge, technology, and view of the universe, yes, we are alone in the universe. Of course the universe is really big, and we haven't explored all parts of it. Add to that the fact that we can only observe and study the observable universe. There's a whole lot of universe out there whose light hasn't reached earth yet. That's why our view of the universe is always expanding. The universe itself is expanding.
We are actively looking for life in other places than on Earth though. SETI (search for extraterrestrial intelligence) is the astronomy branch whose mission is to seek out and find proof of intelligent beings somewhere other than Earth. So far though, nothing.
Right now, the only place where humans are not alone in the universe is in fiction. But I'd like to leave you with a quote from Arthur C. Clarke regarding this topic.
Two possibilities exist: Either we are alone in the Universe or we are not. Both are equally terrifying.
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