Train station etiquette

Have had to commute to the city by train three days this week for a course I’m doing. Normally I drive to work as PT is a very inconvenient option. Have a question for those of you who are regular train travellers- is it normal to push in front of others who have been waiting longer to board the train and the elevator? I’m standing back to give ppl space to get off and every time someone has come along and stood in front of me. Not sure if I’m standing back too far (I don’t think I am!) or if I’m just too polite.