It would be extremely silly to not play a game because you weren't the first person in on day one.
You lost them because you weren't following the game as closely as many people were... and any game that has ever had early access has had people miss out on names because they got the game at release and not a week earlier.
Firstly, there is no way to get to the starter worlds of the opposite faction, so no, you won't get pk'd at 6 by a level 30. In fact, I don't think you even see the opposite faction till mid twenties-early thirties.
I highly highly doubt anyone will remember the angst of this first week after they're playing. As it is, a few days of early access isn't going to give anyone a lasting advantage. Someone may hit 50 a few days earlier, they might get a few more pvp commendations, but eventually you will hit 50, and eventually you will buy every pvp piece you need, and at that point, months down the road... the guy getting them 2 days earlier then you isn't going to seem like a big deal.