Yup. It's the answer that conflicts with sci-fi, but fits out best understanding of how things work. It's also the answer people don't want to hear.

Also we only know of one planet that has life on it. There's really nothing we can do with statistics with a sample size of one. So it's just as likely that we're the only sentient life in the universe as it is there's millions of of sentient lifeforms out there. That is to say we simply don't know.

But I still like sci-fi where there's a lot of interesting aliens that can fairly easily warp around the universe to hang out. But it is fiction.