How to be better at minecraft pvp?

When it comes down to it, if me and another guy, were in a completely fair fight, nobody had an advantage, they would always win against me. Any tips?

Not hating but you might just be bad as pvp… At the moment. Keep practising and try different techniques. I was really bad but I tend to run past hit and turn around, it works for me. At times, under certain circumstances, you may lose multiple times due to your environment.
Hope this helps.