I would take what your T says as an "educated opinion" rather than personally, that you're no good or will have a limited life, etc.

One of my best friends decided to become a psychologist but the science was too much (chemistry, etc.) and she accepted that and became a social worker. Work on your education and you can be the judge in a few years when you have some of the education, etc.

But right now, all you have is someone in the field who knows what it takes and how hard it is and their opinion, from where they're sitting :-) is that it's more difficult than they think you can manage right now; and you have to start working right now to do something like that. The education is grueling. Trying and being disappointed in mid-education that you couldn't do it would be far worse for me, I think. I would have been grateful for some advice from a professional when I was in school.

I would go see your T and talk to her about your problem of being hurt by your belief she was seeing you as limited instead of feeling helpful. I think she very much would want to know that. Perhaps she can explain things to you in a way that you won't see as hurtful? I think the longer you stay away from seeing her the more inertia will get you and that's never good.