When To Give Up?

[heck dead]

first year and a half - 1500 or so

last year and a half + 1500 or so

used be be a gambler when i started but i've been studying and working hard since day one. now i wont take any -ev casino bet period. ocasionaly i play powerball. it's very hard for me to walk away from something i've spent so much time/blood/sweat/tears for. i was very intelegent in school and math. usualy one of the top scores in my schools for the standerdized testing. what i want to know is how long should i keep trying before i give it up? i've learned so much i'm getting much better at roll management. right now my roll is $100. i've turned $6 to $1100 before, cashed $400 and lost most of it back with horendous br management.