Average IGCSES- is it impossible to get into oxbridge?

Hi, pls note this is not a sympathy post, and I need genuine answers even if they are harsh. I got very average igcse grades. I underestimated the boundaries and since we were considered the first non covid batch, it was much higher than accepted. I have mostly as with very few a stars. Talking to well reputed counsellors has confused me as they say I should not even try for oxbridge, while others say it doesnt matter. Seeing that I took igcses and will be studying ib, with a 42+, do i have a chance at oxbridge?