I want to play a more aggresive game

I started playing on line about 8 or 9 months ago I've gotten to the point that I'm making good calls. I've won a few tournys and I've placed in alot of them but I noticed that the more agressive players tend to win but also that its double edged I've seen some gain sizable stacks then just as fast lose them. The better players tend to be agressive but also win when called and they seem to have a knack to know when to steal a pot. The thing with me is I can make it to a final table but unless I get a few good hands I know I'll just place funny thing is heads up I'm a very agressive player.

im not sure what to tell u but if u get up to that big stack early on, i would definately lower the level of aggression and just call low bets...who knows u may catch something