It always feels like somebody’s watching Maika Monroe. The latest film starring the 29-year-old “It Follows” breakout, regarded as a modern-day scream queen, is director Chloe Okuno’s feature debut, “Watcher,” co-written with Zack Ford. Now in theaters, and on demand June 21, the film sees Monroe as a former actress named Julia whose life quickly falls apart upon her move to Romania for her husband’s job. It isn’t just the language barrier upending her day-to-day existence though, but the strange neighbor she’s convinced is stalking her. The paranoia-fueled atmospheric thriller doesn’t just de…