3 things.
1. You can leave when you are two buy ins up and some one wants to get fancy
2. You can find the fold button when it seems you're beat.
3. Its likely to be me on the other end of this probablem because i can put you on certain cards.
So, if you're up and opp gets fancy then leave or beleive them when the make big bets against you. Or else dont bluff/c-bet etc wait for a hand to hit you