^ Hurray for you.
Do you
want to continue to hide it? Keep it private? Or do you
want to be open about it?
I agree with sweetleaf - sometimes an incremental approach is best, then you're not just dropping things on people all the sudden, and they have some time to respond and adjust their behaviour. Plus it's good for you - if they react badly, you haven't proverbially let the cat out of the bag.
You could also just start mentioning a few things - like when your cousin starts with the homophobic jokes, perhaps mention you don't think it's funny and would prefer he didn't do so around you. That might help shift their perceptions, that you are not interested in homophobia, etc.
I told my cousin too. He said he will support me emotionally and wants to see my stash.