just some thoughts here
1. If shes got a problem, the relationship can be worked out if its right for you both and save you hassle further down the line if she blows up in your face
2. You'll feel guilty for not telling her and it will just make it harder later, but if you surpress it, it will just come out in another way later (as you have already found)
3. Say you tell her and shes cool with it: If you do decide to do something about it, she already knows and can steel herself for it. She wont be all 'whyd you not tell me sooner!' that would be much worse, dont you think?
Heck if someone has an problem with you exploring yourself, your self growth and learning about who you are, they must have some pretty stupid expectations and thus arent worthy of you if they try to restrict you. I learnt this over the years in other ways.
Feel free to criticize or challenge my way of thinking though, I know fear can be a kick in the nuts.
If she really loves you and its right for you both, then telling her will allow that to become apparent. If she leaves, it may suck, but hey, exploring yourself is your journey, not hers. You want to sit back and not know and keep feeling bad like this, or do you want to know yourself properly? Is another person worth not knowing who you are and going through all that if they react negatively to it? If she reacts positively then wonderful but in truth, if it was always a part of you and she has a problem, it was inevitable and you havent lost anything truly.
I wish you the best luck, friend