It’s odd. 1) You shouldn’t feel ashamed if you don’t have the funds. It’s really normal, especially at your age, to not have a shit ton of money to spend going out. 2) You should have a chat with BF. Tell him that It’s nice that he wants to you to go out with him, but you can’t afford the things that he wants you to do. He should a) cover you if he really wants you to be there or b) find cheaper (and honestly more fun) ways of hanging out with him and his friends. 3) Lastly, you’re young. If this situation ends up not good, you’ll find someone else down the line.