Help down 8k this year

I been playing poker for about a year, and I am down about 8k so far. I can't seem to balance my bankroll. I played anything from $1 to $200 MTT and SNG. My home is at pokerstar. So far I earned about 3k from makeing the final table, but I got nothing to shown for. I feel sick about my game right now and takeing sometime off.
I am reloading my account at the end month for about $300.
Please tell me how to build my BR back up with $300. Thank you for your help.