Being a lone wolf isn't really an excuse. This is an MMO, you play with other people. If your not playing with other people why are you playing an MMO in the first place?

I got to level 15 on a new class in like an hour just killing mobs and doing my hunting log with about 8 leve's. I just hit 5 at the starting area on mobs and the HL with nothing else. Then went and picked up every Leve in western thanalan, did them while continuing hunting log and soloing a kill X number of mobs fate. I made it to 10 in no time and went to horizon and picked up all those levels and went down there and soloed some of those fates too and made it to 15.

At 15 I found 3 buddies to come level alts with me in the aleport area where we did fates together and we EXP Farmed goblins to 20 And then went to south shroud, eventually picking up a full part level 20-23 where we leveled to 30 and moved to costa del sol. Any time we weren't doing a fate, we were exp grinding mobs.