For the idiots that come on here playing Billy Big Balls and they're the next Ken Block etc, how very refreshing to see someone come on here and just open right up and admit they tried something new, got it wrong, and want a bit of honest help. Ryan, I genuinely doff my cap to thee sir.
Please don't be afraid of switching the TCS off in the future, you've made a mistake and tbh there but for the grace of god goes me when I had my first RWD car and I started playing with moving the back around. I'll never forget it, 90deg right hander, warm summer evening, waaaaay too much throttle and the damn thing pirouetted on me. I've no idea how I saved it, far more luck than skill as I had zero idea of what I was doing. Could easy have been me posting up on a forum with tail between legs.
SuperStu is organising some driver training days at Millbrook, well worth looking into. Or any trackday really, with a bit of coaching on the day, will massively help confidence. Stick with it, playing with RWD cars is one of life's many pleasures and no-one gets it right first time.