Walking down the aisle

Hello ladies, this topic gets me a little sad but it needs to be done. i NEED opinions! My real dad wasnt really there for me while growing up, maybe came to a game or two but when he got married his wife decided he needed to start seeing me ( a week before turning 13). now i am 27 years old and only see or hear from him when he is drunk ( alcoholic) or wanting to come and see me. Which now he has a grandson he barley sees. when growing up it seemed like he used me for a trophy to his new women. My step dad has been there since i was 13 years old. him and my mom has been through alot but hes always right back at home. he has been there for me NO MATTER WHAT even if they wasnt together. Growing up he has came to every game, concert. im like a daughter to him. he attends my sons birthday partys ( just turned 2 on aug 26 which my real dad wasnt). But anyways this is a very hard subject for me. i dont know who i want to walk me down the aisle. i wanted both my real dad to ask my step dad to walk with us but my heart weights down on weather to let my real dad sit in the chair and let him see that growing up and going in and out of my life isnt fair just like someone walking his daughter down the aisle isnt. HELP!!