Beginner question, I think I messed up my warp

I don't have a warping board, so I used clamps with a long post to create my warp. think 4 pegs, 2 on each side of the room. On the middle pegs I always went on the same side to keep them lined up, then would alternate front and back on the end pegs to create a cross.

I finish everything and go to tie off my cross and realize I can only tie off the ends that went forward and backwards around the last peg, not all directions like my book says. Can I use a warp that only has two arms to the cross, it do I need to rewind my bobbins and start over?

This is the second time I've messed up my warp, the first time I used a really fuzzy yarn and it tangled every time I moved my loom so I spend 30 seconds untangling yarn for every 5 seconds I spent weaving. I'm really discouraged and don't know what to do.