So I'll put the disclaimer here outright: I didn't do many of these subjects. What I can say though, is that if you enjoyed these subjects, I think you should give them a go next year, even if you are the first to do it. As far as I understand the situation, you'll be in Year 11 in 2019, which still allows you to change subjects and is still more or less a trial for the real deal (Year 12).
Here's my checklist for picking subjects and I'll run through them according to your situation:
1. Pick subjects according to the things you love. This seems to be the case in both Music and Drama.
2. Pick subjects you need as a pre-requisite. In this case, use
VTAC Course Search to pick out courses that you'd like to take after Year 12 ends and see what's necessary for what you want to do. (By the way, what's your career intentions after VCE?) You can take a shorter route if you know exactly what you want to do after VCE and have completed all the pre-reqs. Music and Drama aren't the pre-reqs for anything as far as I'm aware.
3. This is separated because it should only be used as a last resort and is the tie breaker in super difficult scenarios. Pick subjects according to what you think you'll do well in. In your case, you're worried about this, but if Point #1 already declared Music and Drama as winners, then you know what to pick here. If not, we should consider your other options according to this same checklist.
Out of those other subjects, I can only speak for Psych, however, I would advise that you do not pick subjects purely on what other people thought of them. Your experiences will differ from theirs. So instead, I'd advise that you check up the study designs for these subjects and see if you like what they say. Hopefully that will help you to make a decision. If all else fails, please talk to your VCE coordinator, teachers, parents, friends and perhaps come back with the new information you've found to help make a new, more informed decision.
Note: Lm21074 posted as I was typing. I agree with the points they made and I've pretty much just fleshed out their ideas, so I'll leave this here anyway.