unintentionally hit a girl as automatic reaction

I was near the standing air conditioner and me and this girl (my friend) were "bickering" for who got to be in front of the AC, at the end i sat on the ground getting the cold air and looking down, she put her foot under my knee or arm and started pulling and I instictively reacted and hit her shin with my arm or back hand and immediately as I did it I felt horrified of what I had done and said sorry and asked if she felt hurt, she was fine and replied that she wasn't hurt and not to worry. Like my hand automatically moved as if I was like patting or swatting in a normal way lile "cmon stop", but I accidentally accelerated or used too much force, because when I heard the impact I felt shocked. It wasn't intentional I didn't even realise until after I did, like it was an automatic instictive reaction. It wasn't a hard swat but still, it felt like a karate chop. I feel like I commited assault and hit a woman. I think it's because she was pulling my leg with her foot and without thinking I instictively and impulsively reacted to move her leg away or make her stop but I ended up accelerating too much. She said she didn't feel hurt and when I went to apologise again she started joking and teasing abt me being someone who "hits" girls. I feel responsible because I don't know how much of it was intentional or not, obviously I didn't mean to hurt in any way or form, but the swatting just automatically happened. I feel immensily triggered by this and have extreme guilt. Because now everything that I preach about morals and being a good person feels invalidated and I feel like a hypocrite undeserving of anything. I feel like a women beater, I don't feel like I deserve happiness or the right to pursuit fun or love, without disclosing this thing. Like a liar. Today I saw her again and it was all fine we were laughing and joking around, but the guilt lingers.