It's all been said. If you want to continue in an environment where you interact with other people at close range (like grad school, or an office job) then you need to learn to wash yourself on a regular basis. It doesn't have to be a shower. You could submerge in a bath and scrub, or get a sponge and bucket of hot soapy water and do the job. You can find something that feels comfortable for you.
The suggestion that your mother remind you to bathe is not far-fetched. My brother has a similar disability (PDD-NOS) and mom has to remind him constantly when he needs to bathe and brush his teeth. If she doesn't, he gets distracted with whatever he is working on and forgets. If she didn't keep after him, his teeth would have rotted out years ago, so make sure you have something/someone to remind you to look after that, too.