if you dont want to help than dont offer

I had surgery last week on  my foot and havent been allowed to walk on it at all  i have a roll about to get me every where well meaning  from my  bed to my couch and to the bathroom  and on the occasional outing of the apt those dont happen often because im still weak but im okay and im beyond greatful  who have gone beyond the call of duty to help me and still are and im so thankful  for them and it grounds me so much  and i owe them big time  but than theres  those who have said ohh  let me know if you need anything  and ill help and when that time comes me calling for help  they always back out and say i cant help or your asking too much of people and that frustrates me more than anything because im asking for simple things like help to warm up food  and to hang out for bit but i guess i can see how thats asking to much of someone but im one of those people if you dont want to help thats fine than say so  insted of saying if you need something call and let me know and than  back out of helping because to  that means your not willing to make talk match your walk and  i would rather you own that you dont want to help out at all  than say call and when i do you back out of it   because that tells me you really dont want to help out and than just say so  because you may get called on to help out  and than have to own what you say  but to the 3 you know who you are that have gone beyond the call of duty to help out and done so much for me  i cant ever thank you enough for all your help 
yall are amazing and what have made this surgery eaiser to deal with and helped me keep positive during a difficult rough time 
and i love yall dearly 
and to those who said call if you need anything and than backed out next time please spare me or anyone else the difficulties  and dont offer to help at all