I don't think you should feel like a jerk because of that. If they ask you if you want to smoke then they obviously want to smoke you up, so there's nothing to worry about. If you constantly went up to your friends asking them to smoke you up then it could get annoying.
I used to prefer smoking alone but I'm bored of life at home and now prefer to sesh with some friends and chill and laugh.
I like to smoke by myself to get super ripped, and then have my friends pick me up to smoke a little bit more and just have a good time with them. Smoking with friends results in smoking more in my case, because it takes more to get as high as I want. At home I can load a snapper in my bong and be ripped, but I won't have my friends to laugh and joke around with. There are advantages to both, so therefore I do both