I'm neither for nor against apathy

So I just got a call from my father putting me on a guild trip I'd not have the strenght for. Mom was to come over this weekend, teach me how to bake and spend time with me, but a guy I'm interested in asked if he could come over, so I told mom "some other time, ok?", apparently it was not ok and she took offence. For as long as I can remember I've been feeling obligied to help mom, listen to mom ranting about things that make her feel bad, basically being the shoulder for her to lean on. I'd not have the strenght for it, but now I should take mother over instead of the nice young man, because if I don't I feel horrid and guilty... even if I do allow her to come over I'll be feeling horrid since I don't really have the strenght for it. A lovely little trap this is. Supposed to decide between my well being and that of those whom I care for... People seem jealous of the fact that me and mom are such good friends, I'd so much rather have her as my mom though...
I'm screwed.