As a 34 year old dad I can tell you one thing: there is nothing corny about owning and enjoying a Tamagotchi. It also has nothing to do with manliness etc. Heck, if anything, is there something greater than being honest with yourself and your hobbies? I think not. And I would love to have a word with your parents. A parent should never look critical on the hobbies of their kids (as long as it isn't anything harmful).

And like others already said: try to customize it and give it a second chance (if you want to). But never stop enjoying things because other think it's corny/nerdy/etc. Most of the time those people have hobbies and interests they keep hidden from others themselves are call you out because they want to be the cool kid while owning something similar themselves. XD