I have a phone interview coming up but i dont feel ready. I did zero leet code problems and only reviewed data strcture. I have a feeeling im going to fail...Can i ask to touch base in 6 months with the recuiter and cancel it all together or will that make me look bad?

tldr: not ready for google interview. Should i cancel it and touch base in 6 months or should i take it and fail it and get it over with?