Yeah your probably being to tight/passive when it comes to the bubble or maybe your games lacking the agg factor...Golden Rule: Your playing to win...not get ITM. That being said learn the fundamentals of blind stealing and changing gears when needed....also read up on so heads-up play...

So basically study the following and start to work it into your play:
1) Blind stealing
2) Turning up the agg factor (changing gears)
3) ICM ( once you understand this, your going to go from decent to solid)
4) General hand reading/ranging...

Most of these can be found on articles around here..or maybe try pocketfives...they have some good articels also...