Get an auxilary melee weapon (maybe something cheap like a dagger or short sword) and everything will be fine, I promise! Just expect to pay out the nose, and expect to not be super great early on.
Some hints: You can link an additional hit onto the end of your combo by delaying hits. So if you have a 2 hit weapon, if you hit once, wait a little bit, then attack again, wait a little bit more, you can attack a third time desipte the fact that the weapon is a two hit weapon. If you need to squeeze out as much damage as possible, that extra hit is an extra potential crit that can easily turn the tides. Note you can use smash mid combo too. If smash crits you've pretty much won. This also applies for enemies, so don't let them smash you. You really don't hear a lot about smash over windmill but it's honestly a monster if it hits, it's just really easy to counter, so don't let it happen. This tactic pretty much sums up melee mabinogi combat, it doesn't initially look like it but you can very easily link various skills together until things die. I personally like an extended combo with a smash finisher, assault slash after that, and after they get up if they're in melee range, windmill.
As a mage, this is particularly valuble, if you're up against a rediculous enemy (note, doesn't work on anything with a ranged attack), firebolt it, load counter, load firebolt asap after he runs into your counter, firebolt him after he gets up, counter again, repeat. It takes a load of stamina and MP but it is basically an invincible defensive stance on anything without magic or ranged. This also works with windmill instead of firebolt, but windmill takes a bit more timing, and it can get very dicey before rank 9 of windmill, when the radius increases.
Part of being a mage is finding out when bolts will load specifically, for instance firebolt will not load during the animation of windmill, but it WILL load during the animation of counterattack.
And a pure magic stalling technique from ole sirAaronIII, one of the two wizards in guild, ice revolver. Load five icebolts, shoot an enemy until it falls over. While it is falling over load another icebolt, then shoot it when it gets up. this will perpetually hold it back until it either dies or someone can help you, or you run out of mana. Doesn't work on things with mana deflector.
If you're having issues with any of these feel free to post in the thread or PM me or whatever.