If you're too embarassed to have others realize something you like, you don't have to tell them. It's not like they have a right to know about your life. As long as you see interest and harmlessness in what you do, it doesn't matter what others think.
Honestly, it's cool to like whatever you want to like as long as it's harmless and you're not overindulging yourself. This is why people make fun of "Nerds", "Goths", "Jocks", "Otakus", etc. because they treat their interests like it's supposed to be a way of life. As long as you're smart enough to realize there are things in life bigger and more important than your simple "interests" (in other words, not obsessed with anime, pokemon, or anything else), you will always be "cool".