My best friend and I have feelings for the same person

To give some mild background, we both know this guy. He’s 15, I’m 15, and my friend is 13. She’s particularly mature for her age but still can be a bit stubborn and immature of course. We like the same guy, he’s nice, humorous, and likes a lot of the same stuff as us.

I feel that she likes him more in a way, but I’m not quite sure. I bottle up my feelings a lot more than she does and am all around much more socially awkward and nervous in general. I feel like a shit friend, whom she can’t do anything without so I just go along and bottle up my feelings for her. I care about her a lot and expressed concern for the 2 year difference which she doesn’t see a problem in like I do.

Since I’ve admitted I had feelings for him as well she seems almost threatened. I didn’t want to keep her out of the dark and hurt myself in that way. But now she’s almost gotten aggressive, which is out of character. Like she now feels bad that she’s “getting in between.” I don’t know what to do, like I feel as if continuing to ignore my own feelings for her is gonna drive me insane. But at the same time I don’t want to accidentally put a wedge between us.

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Edit:

He asked her out, kinda hurting but yknow gotta be supportive. The funny thing is I knew I never had a chance, because between her and I it’s always the same. She was definitely more of a barrier to me than I was to her. I do wish them a lot of luck and I don’t want to lose her as a friend it just sucks yknow.