When will I learn that my top two pair isn't good?
I ask mostly because I have a habit of getting into bad spots - Most times I'm either up against a strong draw (or a draw that made it) or a set. This seems to happen way too much for my liking....

If I spike 2 pair on the flop after limping with JQ or TQ or something similar, I'll usually try to check-raise, only to get re-raised by my opponent.
At this point I'll either be forced to call (or shove depending on my stack), otherwise fold and be left wondering why I bothered check-raising to begin with if I wasn't prepared to call the whole way.

On most occasions when I call, my opponent rolls over a set or some odd straight draw that's somehow managed to hit (those 4outer gut-shots kill me).

Sometimes it's not with very good holdings that they made their straight or flush, but then I wonder if I'm playing my two pair correctly (If not, I probably deserve to lose, lol)

I think I've got a lot to learn about playing a hand in poker - This place is definitely giving me access to a world of information; I can only hope that one day if I improve enough at poker, I can come back here and offer my advice to others who were once like me.
What say you people?