Melee have it rough in pvp until mid 20's or higher. Simply because you lack cc's and main abilities that make you comparable.
Bolstered system is to give a server the most population it can for pvp queues without requiring other servers. This is why there are no brackets. If you are really having a hard time with this then simply don't pvp until you're higher level with more skills/utility.
PvP is not for everyone and clearly it's not right for you, at least at your current level.
Players are not scripted are the hardest challenge in any game especially when you run into a coordinated group of them. So, sit back and relax on some of the story/quests and come back when you have tools in your belt.
No MMO is balanced for low levels and it's basically not plausible to do so. So, your best course of action? Get off the forums and level up.