You know, I'm not sure about the 'just toughen up' advice.
Yes, you need a sense of perspective - but you also don't have to just masochistically take it all.
You're a human - not a sponge.
The thing about being a parent is that it's always a high-wire balancing act: you're life becomes some kind of high-wire act; walking across a tight-rope between the past and the future, whilst juggling plates.
The plates are your needs and your children's; their feelings and yours; all the different competing demands and yours.
And that analogy doesn't even capture it. Because the tightrope you're walking is also their self-development and yours : their needs and desires and fears as they grow into their future selves, and your own continuing development as a person.
Your journey of self-hood doesn't stop when you become a mother.
It sometimes feels as though the whole world wants to turn you into a marshmallow when you're a mother - a blob that is no longer a developing person, finding her way - in unfolding time - through her changing self.
It feels as though the world wants you to be a soft, unchanging blob that absorbs all the feelings of others, with no boundaries of its own, no original thoughts, no creativity, no autonomy.
A blob with all the answers, too (which is ironic), rather than a person, who is unfinished and still developing.
And all this comes to the fore in those teenage years, when many teenagers put on a spurt towards independence.
When I say I try to interpret it all as an invitation to re-negotiate roles, what I mean is that I will often try and highlight my own individuality and self-hood.
In a nice way; whilst reflecting back how much I like my children as individuals and the adult's they're becoming.
But it really is OK to have boundaries.
Oh - and I now keep a journal, we'll-hidden, where I scribble away about how pissed-off I sometimes feel and what that tells me about myself and the goals I now have.
(Which is quite a 'teenage' thing to do, I guess. So I suppose I'm rediscovering my own Spring-becoming at the same time ...)