two schools of thought on time travel... well three actually.
1. you would not be able to interact with anything or anyone because events have already played out, it would be like watching a movie.
2. you would only be able to travel backwards in time because any changes you made would alter the future from which you came and thus create an unknown future you could not return to. (included in this theory is the sub theory that anything you changed would actually change nothing but simply cause the events that took place in the first place to take place as they did originally ((IE you try to stop the assassination of JFK and end up causing it to happen exactly as it happened in the first place((( ya thats right, triple brackets bitches!)))
3. time travel already exists in the future but either the first option is in effect or the paradox theory is in play which states that if you travel back in time to change something you would have no reason to travel back in time to change it and thus you wouldn't in the first place but then because you didn't you would travel back in time creating an infinite loop.
TLDR: see this SMBC
comic 
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