The problem you're having was well known. Newbie magicals had a harder time than any other background for many years. For most, the answer was to gain experience and gear in another background and then reincarnate. In spite of this option, many wanted to be blasters for most of their career, and something was indeed done to allow this. Whether or not you like to hear it, Riftwakers is the provided solution, and you won't likely be seeing another.
Newbie magicals have problems finding parties, so riftwalker lets you solo. Newbie magicals just can't keep their spell points up, so spark birth gives lots of spell points back to lower level players. They're the best guild in game for soloing newbie quests, good for cash to get caster gear with, are ok for exploring, and not terrible for exp. Probably they're the second best newbie guild after Tzarakk.
Anyway, you have four main options:
1) Gain exp in another background and then reinc back when higher powered. This is the easiest option.
2) Gain exp and essences using the riftwalker guild, then reinc to pure mage. Or not, maybe you'll discover you like it. This is the smart option if you want to earn essences, and would be mostly painless, though you'll earn less exp than in option 1.
3) Become known as an insanely great party leader, such that people won't care that you are lousy in your chosen role. This will be very hard. Master party dynamics, walking paths, cooking, potion use, learn all the little tricks of the game, and make tons of friends, especially healers.
4) Limp along like a stubborn fool. I did similar as a gnoll ranger with store bought iron battleaxes, so my advice in that case would be to donate for boons and fight only stuff you can kill in one blast.