Question about a bankroll of 700 dollars

people surely go to gamble and play blackjack and do not have a 10,000 dollar bankroll so they cant play min of 10 to max of 100...my question is if i only have a bankroll of 700..its still benefical to count cards and know when to bet and higher amounts but the risk of ruin is just tremdenously higher right? I mean i may not have a bankroll of 10k for 6-7 years lol. Should I just lower my spreads...cuz i would hate to leave the game of blackjack but unforutanly realize my risk of ruin is SKKKKKY HIGH.