Exactly, Bubbles hit it right on the head there.
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Pyro, have you told (/shouted at) them that you really really really REALLY don't like how they never seem to think you're good enough. parents tend to say things and don't realise the effect they have.
My parents every-so-often say that I'm useless and forgetful and it really really made me angry but now, I just say it back to them.
"Why didn't you empty the dishwasher?"
"Because I'm useless and can't do anything, remember?"
It works for me but it does help that they always say they love me. And for good measure randomly say "Remember, Jennifer, our love is unconditional!" or "*grin* but we love you anyway
"
Heh, it easier if you just appear to accept it and even agree with them. But, the first thing you should do is tell them. I know it's hard. If they shout at you for doing something, tell them why you did it and thought it was the best course of action.
If you want to do land management and conservation then you should do it. it is REALLY important to enjoy your work and if you're not getting anything out of school and it wont help you to get where you want to go, then there's little point in staying.