I played eupho in primary school for a year, (or two? Don't remember), and began baritone only 3 years ago. I only played again because I joined a band on impulse, so... I obviously had to relearn everything QUICK. I wouldn't say I'm amazing at it right now, but the general reaction when I say I've been playing for 3 years is (positive) surprise, so... I'm certain I'm not awful xD
It's very sad your school doesn't offer music 2. Most people I know are doing it. I hope you get to do the course you want! I would also like to study music a lot but I'm not sure how my parents would feel about me doing music in uni hahah