I did poorly on a math class that was required to declare the major. It's ironic since now that I'm in the data science major, I have to do even more math class

I did poorly on a math class that was required to declare the major. It's ironic since now that I'm in the data science major, I have to do even more math classes and less programming classes. I would love to do my own startup. I have a few ideas floating around. But I feel like I lack the discipline to sit down every day and force myself to work on them without external deadlines/pressure. In terms of jumping into the tech industry: I understand the advice about looking for any job when starting out. It just seems that even a lot of the entry level jobs are very specialized.