I still don’t believe my new belief (BL)

My new belief for March is: “I will make $100K in my business between now and March 31, 2019.”
I’ve been doing my homework every single day and started taking massive action crafting my business plan and building my email list and making offers.
I don’t feel any closer to believing this thought, though. The thought still feels negative to me. It feels impossible and I keep thinking I’m being too ambitious and I should have a smaller goal I can actually achieve. I’m afraid I’m setting myself up for failure.

What now?