I tell her practicaly everything else- why can't I tell her this?!

I would write her a letter! You can write it exactly the way you would talk to her. In it you can express how you feel and try to answer any questions that she may have. You could even give her the letter in person, wait around for her to read it, then talk to her about it afterward. But the main thing is that the letter would tell the significant things and spur conversation about it.

I would probably write the letter regardless of whether I gave it to her or not. In the least, it could help you organize your thoughts and practice how you would talk to her about it.

I've done the same type of things with close friends of mine. It worked for me! I hope I helped! Good luck!

 

^ Yeah, write a letter. I wrote one to my parents, make sure it's descriptiveness.

 

I agree with the above comments, older generations like an eloquently written letter. Make it clear and not at all ambiguous, let them know that this is you and that there's no gray areas in how you feel.

I wish I could tell my only grandparent, because she frankly wouldn't care, her son is gay too and lived with him and his boyfriend for years. I just can't!

 

I definitely agree with the letter idea, if you have a good relationship with her and you know she is pretty much accepting of different ideas, then go for it.

I'm jealous of your situation, because if any of my grandparents knew, I would be completely shut off. If you have that kind of relationship with her, be honest and cherish your ability to do so. My grandparents would die on the spot even if they found out I had sex with a GIRL before marriage, much less a guy. That's just how old fashioned they are. The only person in my entire family who might understand is my mom, and maybe my cousin and I'm petrified to tell them.