Well if your comics contains NSFW... and you are less than 18... you formally will not be able to read your own comics...
but to be honest... who will bother to ask you for your official documents?

Drawing your NSFW comics with closed eyes, to not see it and thus to not get morally corrupted, is also an option!
Haha, forget, it was just a joke, of course, good kids don't do it, it's very very bad, God'll punish you. 
P.S. If your story is Safe For Work, then, of course, there is no trouble at all from legal aspect. 