Count it as a good thing. I don't think you need this kind of pressure or guild when you're 16 and needing to focus on studies. Find a guild that's more understanding / suitable for your time schedule. Honestly you'll find a better fit. Just add any friends you made to your friends list and let them know they can still contact you if they want to talk and then focus on your studies. Games will be there your whole life if you want them to be, if you mess up at school it'll be a lot more difficult to recover from.