My girlfriend says I’m controlling her

My gf and I have been together for 3 months now and In the beginning everything was great but now, she does things that frustrate me and I had really take time to myself to think because I just felt like I was gonna black out.

I go to see my gf roughly 4x a week that’s if I’m not busy and if I have my daughter I see her maybe 2x a week. She’s 19 I’m 21. Well yesterday I called my gf to drop off her jacked I left in my car and when I called I heard some background noise so I asked her where she was, she said with her neighbor I said no where are you and who are you with, she said her friend. So I tell her to send the address and she does, she asks if I’m on my way and I wouldn’t tell her because I didn’t wanna give her the opportunity to prepare herself for my arrival if she was doing anything she wasn’t suppose to.

The time before this, I told her I was on my way and I told her to get dressed, I said as long as you listen to me we’ll be good, but all the back talk I really don’t like. So she did and tonight I called her and told her to be ready by 12 and that’s when she called me controlling and I asked her to repeat it and she said “nothing”

I really feel like my gf is trying to pick arguments with me and I don’t know why. I don’t wanna lose her so whatever it is or whatever advice I can get I’ll take.

Edit/ I’m reading comments that say I’m controlling but no one is telling me exactly what I did that was wrong. I want to change but if I don’t know what I did, I can’t do anything differently.