I think you have to separate a feeling of being rigged and being actually rigged.
If you are convinced it is rigged why don't you try to prove it?
The fact is that pple online play different poker. Yes, it happens to all of us that there are days where every single hand that you are involved in and you are favourite to win you lose, but those days pass. The same happens i am sure in a live game. How many times while playing live you are completely cold decked, how many bad beats you suffer when playing against certain players, online is more visible and memorable. For some reason we don't hear winning online players suggesting that the online poker is rigged. I am not talking here about some dodgy poker sites, but i can't imagine that a lot of pros would play on well known sites if they suspected those sites are rigged.
Online poker is subject to, one way or the other, to cheating, but so live games. In order to win online, one must adapt their style to new conditions. In a live game you can see much easier who is drunk, crazy, want to have fun or play 'proper' game. Online you can only guess. Betting patterns and little tells can provide you with some information but you don't know for sure if your opponent is watching tv, do their washing or make dinner while playing a game. This in turn can result in people calling your raises with random stuff and as a result you can be outdrawn more often, as esp in lower stakes people will see you to the river with all sort of crap.
I think your attempts with online poker and your experiences have more to do with your style of play and your limited knowledge of the techniques needed to play the game then the site being rigged.
Perhaps your live gamem is heavily depended on reading the physical tells and not betting patterns of your opponents. From what i deduct your experience online is shortlived and instead of blaiming the site for your misfortunes it would be advisable to actually read some posts and spend some time to adapt to new approach to the game.
Online poker and live poker require slightly different skills, and once you realise this, perhaps you can then try it again.
excellent post.