I don't mean to sound harsh, but...

You kind of seem like you're stuck in a "woe is me" funk. Instead of taking the steps to overcome your dilemma, you look to make excuses for your shortcomings instead of changing the way you go about playing. This is a very common reaction to criticism, but hopefully you can take a deep breath and see yourself working through it to a positive result.

Honestly, though, ranking is not THAT hard. Giant mercenaries will help you out a ton once you can buy one, making solo leveling doable as pretty much any class. Dying silly deaths happens to the best of us, just keep trucking. I don't sweat CON that much, you'll have plenty of trains for it as you rank up to make it a non-issue unless you're seriously suicidal.

Roll with the punches, man... Don't go straight to the canvas like a punk!