Being a mom, I can give you a mom's point of view:

I love my daughter more than anything. We may have our disagreements and troubles from time to time, but that does not mean that she cannot come to me regarding what troubles her.
I am her mom. I am here FOR her, throughout whatever troubles her. I would be devastated knowing that my daughter felt that she couldn't come to me for whatever she is going through.

Please know, that your mom LOVES you. And I'd be willing to bet that, she too, would be devastated learning that you are suffering alone in this.
Go to her, however uncomfortable it is for you, with the faith knowing that she will NOT judge you.
This is what mom's do. Love our children unconditionally. Granted, we may express our disappointments, or even disapprove, but that does NOT mean we love you any less.

BY investing into your mom's trust, you are in fact securing your bond with her even greater.
Have faith in your relationship with her. Go to her. Trust in her.

I wish you all the best.

Shangrala