Can't concentrate and losing patience

AAArgh I need to stop
a) getting bullied when a middle stack
b) getting bullied when the largest stack on a table

Not sure what it is at the moment, I can start off OK then end up getting frustrated.
Just seems that whenever I want to play, raises come at wrong time for so-so cards, then if I get a bit more aggressive someone goes over the top. Keeps ending up with me getting so hacked off that I make a bad call which puts me out or nearly out.

Really did my head in this afternoon when I doubled up early on Mansion, had twice as many chips as other people on table, just could not play with them - raises were called or re-raised big time, not once did I manage to exert any pressure, in fact seemed that people were putting it on me. Twice I played medium pairs with reasonable confidence, twice I had to lay down to people re-raising huge!!! and as for the other hands I don't even want to remember.... In the end I just had to wait for AA and be thankful for it when that got re-raised too.
The latter tables got better but just didn't feel right at all early on.

Hopefuly can look back on this post in a few days and feel better about it.