In the moment, it sucks. It sucks royally. It sucks to feel sad, to feel angry, to feel pain. You know what?..suck it up buttercup, this is yoga! It makes you feel. It makes you work for it. It makes you dig up all the buried crap you have been ignoring or too afraid of dealing with. It makes you delve so deep that you have finally given yourself the opportunity to deal with the consequences of who you are. So in the moment it may suck, but at the same time, it feels really good to finally, fully feel.
If you can create a safe for yourself, in your body--to experience these emotions without judging, just accepting whatever comes up, and riding the wave--you, my friend, are really doing yoga. Your practice is far more advanced than the man who can put his feet behind his head.
The more we release our pasts, the more we are able to be present and enjoy everything that this moment has to offer.
So don't hold back your tears, your fears, your hesitations, and don't tell yourself that you're being ridiculous the next time pigeon pose makes you want to bawl your eyes out. Remember, if yoga makes you feel like shit, that just means it's working.