AITA for being territorial over my humor?

so my friend (15yr F) we can call her avery. and i, (also 15yr F) have been friends for a few years now, and we’ve never really gotten into an argument or even have had a disagreement before because we’re really the same person and we get along with each other very well. though, there has been some things that have popped up with her that have made me uneasy about things. ex. in my eyes stealing my humor to try to get laughs out of it.

one thing about me is that I have found a lot of self appreciation out of my humor, and as I’ve grown over the years i’ve been less insecure about how I look because I feel like I wanna be more funny instead and to be that kind of “people pleaser” person.

most of my jokes are pretty dumb, but I’ve had multiple that stick in our friend group and make people laugh every time it’s brought up and it makes me really happy cause it’s like oh I’m making people laugh so it makes me feel like im actually enjoyable to be around. that mindset sprouting from past friendships and being left out because i’m simply to “boring” or so on.

so basically, avery also has a good sense of humor and she’s very known for making people laugh in sad situations and stuff. but recently, I realized some of the jokes that she’s been saying have been my jokes.. but I also don’t wanna say they’re like completely my jokes because I don’t like it when people “joke hog”, but I’ve caught her in multiple situations her saying the jokes that I’ve come up with and then saying that she came up with them if someone asks about it.

like say for example, we were at an event w our friend group and on the car ride there with avery in the car I had said like a funny joke, revolving around one of the guys that we know and it made her laugh a lot. and then so we got to the event and we’re upstairs and we’re all talking and one of my other friends walks up to me and tells me the joke that I said in the car.. and I said wait how do you know I said that and then she was like no avery said that? and so I was like wait what do you mean? and that friend said like, yeah avery just made it up... all I did was just look at my friend and was like “ok.”

there are multiple other examples that I could give, but I don’t wanna make this too long. but yeah it’s led me not want to hang around her as much anymore because not only does she do that with my jokes but it kind of makes me question like what else is she willing to steal from my life if she already can steal my jokes like that. and so I don’t know I’ve just been pretty uneasy about it and I’ve told myself over and over again that I’m just overreacting and it’s just a joke which I still think about that and I completely would understand if i’m the AH in this situation, but at the same time like again I’m just really iffy about her