Is It Weird That I Feel Bad?

caught (what is presumably) mouse #3 and set him outside. i clearly can't leave them in my house to run amok when i'm away (amok, amok, amok!), but i feel awful for exiling them to the frozen tundra that is the outside world. i worry that they won't find a decent place for shelter or enough food - what the hell is wrong with me? they're field mice - they know how to survive outside, right? but what if they're little, and were born inside... will their instincts still kick in so they can find food and shelter? or will they freeze their little tails off? i'll feel terrible if i went through all the trouble of trapping them and setting them free just to give them a death sentence outside. i think i need help... or a higher dosage of zoloft...