Have you looked into attending any taster sessions at your local university? Many universities offer sample lectures, lab sessions and other events for local students. Experiencing university-level sessions of a few subjects may help you to decide what you may be interested in. You say you don't want to take a gap year, but one year is very little compared to years of regret for choosing the wrong career path and not being able to afford to go back to uni because you wasted the finance on a degree you weren't sure on. If no university courses are appealing to you, maybe university isn't the best path for you. Have you considered degree apprenticeships or similar?
Nothing wrong with going to uni a year later anyway, loads of people go to university in their 30s or older.