Two questions, could really use some help.
To put it bluntly, anyone who told you that Mesmers were useless in PvE at level 80 is a complete and total moron.
Elementalist using a staff is something you might want to consider, though I’d recommend the Mesmer to anyone as it is simply an amazing class at 80.
I made a elementalist and am leveling it now, will get it to 25ish and see how I like it.
That still leaves the problem of me lagging behind my tasks in level >.<
You should not be making a bee line from heart to heart. There are usually events and stuff to kill in between.
Alternatively you could just clear all the 1-15 zones first. That will pretty much leave you ahead in levels forever(unless you later decide to simply run through some zones without fighting anything).
Do you craft at all? That nets you a ton of XP. Also you don’t have to just do content in your race’s levelling zone, so if you’re a bit behind see where else you can go for your level.
My problem with crafting, is I have no money to do it with. I don’t have an alt or friends to help me with that. Right now across my entire account I have like 34 silver, and no idea how to get more.
As others have said, there’s no reason to restrict yourself to one zone. If you run out of tasks in one area but still want to level some more before moving on, go find another zone that’s near your level and do stuff there. Easy peazy.