Is it normal to be bestfriends with my mother

Coming up my mother and I wasnt close. But when she got sick and I matured more we have become best friends. We do everything together. I am 20 she's 42. Shes not the tpe that wanna act young. she is very aware of her age. Neither of us like clubs so its not like we party together or go on dates together but its like we talk to eachother about any or everything...except sex of course. I just dont think thats appropriate. I dont tell her absoultely everything but just about everything. We talk our problems out. We protect eachother. I fight she fight I beef she beef. I still respect her as an adult so I dont curse at her I dont talk back im not disrespectful either. But where ever she goes I go. We even work together. We go places like shopping, to the movies, hanging outside with other mutual friends, going to dinner, getting our nails done...theings like that. Im friends with her friends and she's friends with most of mines. I guess you can say im spoiled because as soon as she come home she like to take a nap or lay in her bed and watch t.v && everyday i'm right there at the end of the bed with her. She buys me any and averthing i want. When im sick she is right there babying me. When I decided to move out she begged me to stay until I finished school. Basically my mother is my WORLD!! I would lay down and die for my mother.

So is that normal?? Where i come from mothers are either on drugs or just dont care about anything so all my friends are amazed on our friendship. But some people say I love my mother too much and we hang out too much. I would rather hang with her than most of my friends. simply because she dosent bring any drama, she wont stab me in the back and I can trust her to the fullest.