When I go to a bar with my girlfriends and a guy offers to buy me a drink, I always decline because I have a boyfriend. I wouldn't want to lead anyone on and have them spend money on me!
Girl, take that drink and don't be ashamed. At least you wouldn't have to pay for the drink!
True lol but I feel sooo guilty and I don't want anyone to have expectations that I am definitely not going to meet
That's when you say politely, I'll take the drink but not your number. Nothing to feel guilty about since you would be using your manners. 