Ex young carers, how do you learn to move on?

I've had to care for my mother who was an alcoholic for the majority of my school life (from primary school all the way to college). For so long that it gave her very serious health conditions throughout the years.

I've just been accepted to university for the second time (the first time I left uni to help out again because it gave her cancer), and I've been home since. I'm going to university in September after years of it just being us at home, (she has been sober for a few years now) after my sisters have moved on to higher education.

She is now kind of guilt-tripping me about the fact I will be leaving her on her own and trying to make me second guess my decision to go. I feel so awful that she will have noone and I don't know how to move on from the feeling that she is my responsibility still.
I'm worried she might relapse, either 'accidentally' out of depression or on purpose to try and get me to come back again.

I was wondering if there were any other young carers who have gone through similar and how you dealt with this? The friends I have spoken to, while I appreciate their advice, tend to come from the standpoint of a 'normal' background so it's often hard for them to understand the feelings behind it.