Performing the Same Jokes Doesn’t Make it Boring
When you're starting out, I cannot emphasize the importance of building that core act. You should do it constantly, revise, refine and polish. Add act-outs, tags and toppers. Until it crushes. Worrying about your friends hearing the same jokes is counter-productive to you really developing and polishing your act. Not to mention that it can have a cascading negative impact on your development.