Why does my sweat SMELL so BAD?

So I really want to start working out but since I REEK when I sweat, I kinda don't wanna exercise at all because I sweat very easy. I hate it because my sweat makes it so I can't do ANY exercise! What are some reasons why someone would smell so bad when they sweat and how can I stop it so I can actually get some exercise in my daily routine? Please help me.