It’s a shame that you weren’t able to get on some of the rides BUT don’t be disheartened about it. Years ago I was about to go on Vampire and had a panic attack so just walked out of the station.
I remember following the construction of Colossus then when it opened I stood for 2 hours waiting for my older sister and her boyfriend to ride it!
My first big coaster was Space Mountain (back in 2000)and I think the only reason I went on it was because I couldn’t see the track layout. But in all honesty, coasters look a lot more terrifying than they are in reality. Oblivion looks very intimidating and when I first went to Towers back in 2013, I had done the other coasters fine yet I cried going up the lifthill on Oblivion. I ended up loving it so much - I know it’s easy to say and harder to put into practice but worst case scenario, you go on a coaster and hate it - it’s all over with so quickly you can just say “yup I’ve done it but never again” - since I conquered my fear of rides 5 years ago, there has only been one coaster (out of a fair few) that ive ridden and hated and that was Wild Mouse at BPB. But I’m glad I got to experience it even though I was pooping myself!
Youll get there - and I bet that once you take that step (as hard as it is) you will wish you’d done it sooner - the thoughts that go through your head are far worse than what you experience on a coaster but it is difficult to face any fear. I personally am petrified of flying - never been in a plane in my almost 38 years on this planet - I have so many scenarios go through my head just thinking of it.
You’ve done Wicker Man so you’re doing better than my younger sister who literally has a panic attack on log flumes and the only coaster she has ridden is Scorpion Express (when it was Runaway Mine Train)!