Finish leveling. Once you hit level 50 you stop leveling per se and start gaining champion points instead. Once you hit Champion Point level 160 gear stops leveling. Meaning armor and weapons. Meaning you can now take the time to collect full sets of good gear because you won't ever out level it. Gear effectively reduces in quality, as you may have noticed, if it is a lower level than yourself, which is why being well geared at level 45 is a lot of constant work with very temporary reward.

160 probably sounds like a big number to you but it goes pretty quickly. Pop whatever experience scrolls you have and grind random dungeons (doing the Undaunted pledges as well since the XP scrolls boost all sources.) Imperial City and PvP in general are VERY slow ways to level, just so you know.

You'll be there in a day or two... Maybe less. Then take another day trying to find some good gear for yourself. A cheap set of gear sold in guild traders would be ideal for jewelry and weapons (I say this because crafting jewelry is expensive and you might not find help with this,) and for your body armor pieces try to find some nice person to craft you something.

After that? Make sure you're going to the No-CP Imperial City not the CP one. Honestly you'll still be at a disadvantage because you might not have any monster sets or mythical items, and also just because you're new to the game. But you should feel much better after you do this.