How can i Become stay commited to body building?!?!?

I'm 14 and I'm sort of skinny and my family keeps telling me to lift weights! The thing is one day I'm body building my but off the same next day but then the third day I'm to lazy to do it and it stays like that for like the next 3 months!!! So to all you guys who r addicted to bodybuilding please give me advice,

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