Wow! You are doing great for a first quilt...mine was a super simple little lap quilt.
I agree that you should "Fix" the pictured square to try to save the block size as much as you can.
My daughter sews for 4-H contests and her mantra is: This is going to look so great when it's done...this is going to look so great when it's done...
Don't despair: It's going to look so great when it's done. :thumbup: