I already put a little on and it doesn't burn or anything, but I'm afraid if I go deeper it will hurt me or something. I'm only going to use my fingers so is it safe?
That is not safe at all because your body can react to the toxics from the bubblebath soap. If you can get your hands on any lube that is used for sexual intercourse use that. I rather you not use bubblebath soap, it might sound nasty but spit is a good lubercaint.