Shawn Mendes is opening up about questions surrounding his sexuality, sharing that it’s “felt like such an intrusion” because he’s “just figuring it out like everyone.” The 26-year-old singer-songwriter addressed the topic before performing a new song called “The Mountain” at a show in Colorado’s Red Rocks Amphitheatre on Monday. Based on fan videos, “The Mountain” seems inspired by rumors about Mendes’ sexuality. “You can say I’m too young/ You can say I’m too old/ You can say I like girls or boys/ Whatever fits your mold,” he sings. “Since I was really young, there’s been this thing about my…