Time travel

So I'd like to travel in time but lack any grounding in physics etc

I've been doing some research on the internets and wondering if I should take some courses at uni or something

question, wouldn't time travel into the past violate the law of conservation of mass/energy? since, for example, you from the present goes back to the past, the matter of your body now exists in the past where it was'nt before. or is there some resolution to this.