question about stock issuing

I was curious about how it works when companies issue new stock, and I couldn't find a super clear answer online.

Let's say i manage a company and own 50% of it worth $50. 50 shareholders own the other half in the form of 50 shares together worth $50 as well.

If I want to issue another 50 shares at $1 apiece, will these 50 come from my shares?
Or will another 50 be created and sold, resulting in me now owning only 33% of the company, but still having $50 worth of a now $150 dollar company?

Feels like I'm missing something here, and I probably am.

Thanks