Anyone else feel in over their head with excel?

I just got a fundraising development position and the comms part I’m good at, but I am awful with excel and really struggling and feel like I’m going to get fired. This is my first time working in fundraising with excel… have only ever planned events and given money to charities on a small scale.

Should I quit before I change health insurances and finish on boarding? Or did anyone else feel this way? I love every other aspect about my job but I’m terrified I’m not suited for this…..