i am going apologize first, because i know this is all going to sound really harsh. and frankly, i didn't get enough sleep to post the 42366243 verses that are crashing into my head right now (maybe someone else will and help me) but my gut response to this is:
do you think that Jesus feels used by you?
because you were born already a "goner" because you inherited sin nature. it was because of God's love for you and me that He sent His son to die an agonizing death in obedience, after living a sinless life, all for us. and further, in His desire to cultivate a personal relationship with us, He left us with a Helper so that we would never be alone.
the answer for me? no, i may get impatient, frustrated, or disappointed by others who need help but make it hard for me to share it. but if there is one thing i WON'T feel, it is used. i'm sorry to say, but it really is that simple for me. there's a lot of stuff that i screw up, miss opportunities and completely blow. but every single day, about a twice a day i pray that God will use me to be a blessing for others. i know that it's what i'm partly here for: to serve, to love, to bear one another's burdens, and to grow more Christlike. this is yours and my calling as a Christian.
can we spend all our time only serving? of course not, we'd be all burned out and have nothing left to give. but that is why we have to discern when we need to share, give, serve, and when we need rest, fellowship or those things that give back to us as well.
i really wish i could tell you that i understand how you feel. but i don't. i've never viewed cc as a place for me to be "fed" and "nurtured" as much as a place where i thought i would serve others and be served as well. some of that time i spend serving are in those moments (or hours!!!) writing long posts and pouring my heart out, crying a little, even agonizing over someone's awful situation, even knowing that i might never hear from them again.
the fact is, part of my obedience in faith is knowing that my part might only be one tiny piece, a planting of a seed. a show of love where nothing but intolerance was shown. my piece or seed can be used by God and grown far beyond that. if i am really doing this for God, it means that i can accept the fact that i don't get to always know the outcome. so when someone comes to heart, or i visit back a thread where no update was, i sometimes will quietly pray, wonder or just be hopeful. i wish it was different. but what else can i do?