Am I doing something wrong with my butt exercises..?

You can't do anything about genetics it is either there or it's not. Surgery is the only thing that's going to give you something Mother Nature doesn't ouch. Just try to love yourself the way you are, thats a big lesson for a lot of people.

I forgot to ask if there were any particular foods that could aid in a bigger butt!

Any food that gives you a calorie surplus.

Best butt exercise I know.. Squats with a barbell. Lift heavy. Worked great for me.

This.

I don't want to be party pooper ( no pun intended) lol but you either have a butt or you don't, there isn't much you can do short of surgery ouch. Cookies always helped my *kitten* grow, so I avoid them.

Did you manage to grow your glutes any? I know I'm a bit behind the times writing on this post haha, but I believe it is possible- I used to have a non existent bum. For me, I focused on shaping my hamstrings to achieve a bigger bum. Things like stuff legged deadlifts, kickbacks with cables, normal deadlifts, and obviously normal squats were incorporated in there too. My favourite exercise for glutes are Bulgarian split squats (using the smyth machine enables you to lift very heavy)... I could swear by them. I would put the back leg up on a bench, and the front leg should be bending, but not going over the ankle. Try to not push on the back leg at all, and just squeeze those glutes:). Took me a good half a year of training to get my glutes bigger, but it was all a trial and error process, was a bit clueless at the beginning concerning diet etc, but basically, eat very clean, and lots:). Take complex carbs immediately after training, and then your protein. For any other meals, eat your protein first so that it is absorbed first:).
Hope you got your big butt that you wanted:)