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Well, I am also assuming you are playing the new version since there are no abandoned rafts in the old one.  At this point, there doesn't seem to be any way to turn your boat but typically, I don't really have a need to as I put nets all around to collect resources but if you miss something and want to go back, the sail and paddle should work if not bumping into an island or the abandoned raft. Something I haven't tried yet that might work is getting an anchor and anchoring yourself down then using a sail / paddle to try to turn yourself around. Good luck and hopefully you find something that works

Thanks for the suggestion, I tried this in creative mode but anchor  only fixes the position within a certain range and thats it.
Tried this out with one sail, two sails, no anchors, two anchors, all kinds of angles and combined with paddling while swimming towards the raft.. nothing really works, this is a really basic and important issue, Its frustrating to keep missing most of the items in the normal mode until I find a raft or an Island  to crash into..

This is the only Issue Ive had in the game.. oh well.