Aww dont worry Kevin you will get through this
Maybe there is some way of getting them to find out if you don thinnk you can tell them, you could maybe write down on a sheet of paper what you would want your mum to know about how you're feeling and maybe leave it someone she would 'accidently' find it....if that makes sense?.....
I know how difficult it is
, but its so much better when you can talk to someone and get some proffessional help. Maybe you would feel more comfortable talking to your sister? She seems as if she has your best interests at heart, you said she talked with you when she first found out about how you felt.....is there any way you could talk to her do you think?
Wow, im really sorry that you're feeling like this but remember we're all here for you