i'm i too passive?

[allyasia]

3.5:1 pot odds. on the flop, and folded if i didn't improve on the turn.
on the Turn 3.62:1 pot odds to call when i improve, and i did, but i don't feel i'm strong enough to lead out.
River 3.31:1 pot odds
are those odds enough to call here? or i'm just simply use pot odds the wrong way?
*i can't find any books that discuss about pot odds other then odds on str8/flush draws.
i did like to know
what's good odds to call the rag flop with nothing but over card.
what's good odds too call the rag flop with top pair or top set on a 3 suited board.
let's say, everybody fold but you and the other guy, and you have position. and he lead out.
are the odds to call change when you don't have position?