Is a career in clinical psychology even realistic?Watch
'Child and Adolescent Psychotherapist' is its own profession, but confusingly several professions also offer therapy to children, one of which is clinical psychology. Here is a career map that has many but not all of the various psychological and therapeutic roles: https://www.ppn.nhs.uk/resources/careers-map. Secondly, you don't need a PhD (a research degree) to practice as a clinical psychologist but a DClinPsy.
Reallistically, you will need to talk to a lot of people, get some tailored guidance and do a lot more research to get a sense of what routes are available and how you stack up against the competition for each one. That is what most aspirants need to do, and really it is the first step you need to do before making any further decisions. Also if you are discouraged this early on in the game it's not a great sign; the route is fairly brutal and it gets worse, and most successful applicants are resilient as well as academically able.