Im 21, married, and have a child, and I still play with tamagotchis and I am not afraid to admit it to anyone! So what if someone thinks its stupid, its probably because they are a little envious because they think it is kinda cool and they want one but are afraid of being teased themselves so they just do it to others. If you are REALLY that worried about it, then just pause your tama when you are at school or have your parents take care of it (my sister has my mom watch hers while she is at school...my mom takes it to work with her lol). But honestly, I doubt anyone will make fun of you, its not like you will be playing with it during class so no one will really notice, and between classes you wont have much time at all to talk to friends so you dont have to worry about people seeing you feeding/playing with it. Its pretty easy really, and if your friends seriously tease you about it, then they arent very good friends are they? I think you will be fine though, they are alot more popular than most people think and others are just worried they will be teased too so they dont tell anyone they have one.