Sore Ribs

Hey guys, really new to surfing. Tried it out many years ago but used a wetsuit as lived where the water was colder. I now live in the tropics and am trying to get back into it but my ribs are killing me! Cant do 2 days in a row its impossible. Any ideas? I really thought that u d get rashguards with a rubber insert but cant seem to find anything. Is this something that goes away with time? Thanks all!