120hz *does* give you an advantage, there's no doubt. Just as somebody would have an advantage playing at 60fps in a room full of people playing at 30fps. The input lag from 120hz is a minor benefit, but your *reaction time* advantage is noticeable because its somehow easier to notice things quickly and to get your aim precisely where you want it.
That said, most people online are not using 120hz monitors. There might be some, but the vast majority of people are all using 60hz, just like you.
Its still worth looking into 120hz if you're serious about multiplayer gaming(or just like high framerates), but its probably not an issue with your competitiveness at the moment. If you're somehow not feeling comfortable with your aiming or general mouse control, you can try messing around with sensitivity settings or go into your mouse settings on the control panel and see if you have 'Enhanced Pointer Precision' selected. This is mouse acceleration and with it on, you inputs are sometimes exaggerated. I think most competitive online players like this option 'off' for increased precision(I know, that sounds counter intuitive to the option's name, but its true). Personally, I've gotten very used to having it on, so I don't think it hurts me much, but definitely try it out yourself for a while to see if it makes a difference. It might feel weird at first, so give it a few matches to warm up to it and see what you think.
There's also the option of getting a nice mouse. A Steelseries or a nice Logitech one are popular choices. The DPI number(most nice mouses are adjustable) is basically just sensitivity so don't think that number means everything - something a lot of people misunderstand. A nice mouse can indeed be more accurate, and often come with other benefits such as extra programmable buttons, which I like in a game like Battlefield.
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