Help with underarm order and heavy perspiration? How to fight the smell?

For the past few weeks it's been in the 80's and 90's ( mid 20's to 30's Celsius) with 100% humidity making it feel like over 100 F. I'm a college student and I have to walk to all of the campus buildings everyday.
I'm constantly in shorts and tees to stay cool and I shower twice daily.

The problem is that I always end up smelling bad within 10-15 minutes of being outdoors. I've even tried washing my underarms in the restroom between classes and reapplying deodorant. The smell always comes back. Also, when I wear tank tops the smell is more noticeable. I work in groups and I worry that I smell bad.
Updates
+1 y
* I meant odor but, the auto-correct changed it lol
Help with underarm order and heavy perspiration? How to fight the smell?
Post Opinion