Hello, welcome to the forum..
I know the medications can have some very scary side effects, but honestly, the complications of untreated crohns can be far worse, even if your crohns is currently in remission, you can relapse at any time, and this risk increases if you aren't taking maintenance medications.
Personally, I'm not on maintenance meds, but I would prefer to be as I feel as though a lot of my symptoms are still present.
Have you been checked for any other side effects?
Have you had any repeat testing done recently? the results of these would give you a better idea of how well your body is coping, it is possible to have inflammation without symptoms in some cases, which can become dangerous. You may have a case for lowering the dose of your mercaptopurine (also known as 6MP) or for switching to another similar medication like azathioprine (Imuran) but removing medications altogether might not be an option at this stage . I understand wanting to see how your body copes on its own, but its far better to be safe than sorry. If you were to flare again, you may need another high dose course of steriods and it may take longer to get it back under control, although safer than many other medications may be, steroids are not made for regular or long term use, as they too have many potential side effects, including thinning of the bones if used for a long period of time or frequently at high doses.