I think that there is alien life.
1st: There are trillions and trillions of stars.
2nd: There is about a 0.000000001(not sure of the exact number) chance that a star would have a planet that remotely even has a chance at producing any kind of life.
3rd: That alone would still leave alot of stars.(Not the best with math)
4th: If you conclude that each star has at least one planet, the odds of at least one other planet besides Earth having life are fairly decent.
I'm not saying it has to be complicated life forms, but nonetheless still life, and I'm not saying I'm 100% sure, but I think there is.