Generally speaking I don't scare easily, and think most horror movies are hot garbage, but I have seen a few lately I liked.
The Conjuring actually DID scare me a bit. Kind of falls off by the end, but there are some genuinely creep-ass moments earlier.
Babadook was more of a stealth drama masquerading as a horror film, but it has its moments, and is just an all around well made film.
Honeymoon hasn't been recommended by anyone yet, it was really quite excellent. Strong performances.
Bit of an older one, but The Loved Ones was pretty entertaining. Less "scary" than "truly fucked up", Audition style.
And I assume you've already seen well acknowledged films like Blair Witch, the original Paranormal Activity, Let the Right One In, Cabin in the Woods, etc, etc.
BONUS - Not really a traditional horror movie, but Hard Candy is one of the most harrowing/unsettling films I've ever seen. And on the "harrowing/unsettling" front, I remember recommending Compliance for a horror seeker for similar reasons (although that one, being based on a true story, is genuinely upsetting).