What Causes Blocked Ears And Frequent Ear Infections?

My Ears ALWAYS Get Clogged Every Single Time I Yawn , Swallow Or Blow My Nose & I Have To Pinch My Nose And "Pop" My Ears. After A While It Starts To Hurt The Inside Of My Ears From How Much I Have To Do It . I've Always Had This Problem But Didn't Think Much Of It Until Now Cause Its Getting Worse. I Cant Even Count How Many Times A Day I Have To Do It , Or Even How Many Times An Hour . The Only Way To Prevent It Is If I Tilt My Head Putting Presure On My Ear With My Shoulder WHILE Swollowing , Blowing My Nose , Or Yawning . But Obviously I Cant Do That In Public , Its Embarresing . Also I Have A History Of Always Having Ear Infections . Please Help Me Understand Whats Wrong And Why I Have This Problem .