Just use my stink-ass inners repeatedly would fully gross me out on a good day. I know very well it's a hygiene problem. I also know that many people around me on the bus, or maybe even in classes, seemed to feel me having a big BO even if it wasn't as apparent for me.
There's never a a perfect moment so just pick one thing and take the first small step today. I took my shot last year to enroll in a new undegrad program and it's going so well. Can't wait to finish and graduate. You can do it too.