Kathy, please don't write 'wanna'. It looks horrible. Possible means it can happen. Probable means it is likely that it will happen.

Everything is possible, but it probably won't happen.

Yes. Agreed. Leave "wanna" and use "want to". Affectations are not a social benefit. I cannot really add anything. Possible can be extremely unlikely. Probable means that some action is almost certain to happen. It is possible that I will not use the Internet again today. But it is probable that I will use the Internet again today.