Well, this is just my opinion btw, maybe you should try a 1 on 1 RP with someone on the forum first before going into the actual Casual RP if you're feeling THAT out of place. Get some experience, and when you feel confident again come back and show us what you and your character can do :3

Or... You could just wing it and try to have a fun time xD Either way, you get more experience in the medium and get some amusement out of it.