I will not promote, M19 - After long preparation I am seeking guidance on building my first legitimate start-up

I'm 19, the oldest of 4 in a low-income, single-parent household. After working 13 jobs, I’ve saved enough to commit a year to building a startup full-time. My biggest roadblock: **identifying a real problem worth solving.** I understand that solutions in search of problems fail, so I’ve spent the last month trying to talk to businesses—cold emails, calls, in-person visits—**hundreds of attempts, almost zero useful responses.** I know the best startups solve real pain points, ideally B2B, but I can’t even get in front of decision-makers to ask what their problems are. **How do you actually get businesses to talk to you?** If you were in my shoes, what would you do to get the ball rolling? I’ve studied all the Y Combinator advice and know I need real people with real problems—but getting access to them is proving nearly impossible. Any advice on practical next steps?