Is it wrong that I am not going to disclose my mental illness upfront to others?
How do you think people would react if they found out about your illness?
They might be distance themselves from me or even loathe me for it.
It can be really hard to tell how people will react to finding out someone has a mental illness. It's really okay for you to keep your mental illness to yourself when you're casually dating someone. Once you know it'll be a long term relationship you should tell them.
I'll tell them if they get curious by themselves.
It's fine to keep your mental health concerns to yourself. You should remember that you are more than just a mental health condition. Not telling someone about it upfront will actually let them get to know you without judgements.