Im not quite sure what you are asking, I see what you are saying but aggression is only a part of it..the real problem is being attached to the money you are playing with, you have to let that go.
The object of the game is to win the pot, yes, but once the money is in the pot it doesnt belong to anyone, it is now the pot and you want to win it.
Ideal if you have the best hand for that pot you want to maximize your winnings, in other words, enlarge the pot. Now, on the other hand, folding when you know you are beat is not losing. Yes the pot went to the better hand, but the money was nolonger yours, so what really happened was you saved money.
If you look at it like you lost the money cause you folded then its gonna mess with you. but if you want to become more aggressive drop down in price.
So, that being said, the object of the game is to win the pot so a weaker hand has to push everyone out to win. Dont let them push you around.