is there any amd cpu that i can buy ?
I would definitely suggest you buy into AMDs Ryzen CPUs, as they have great value AND performance, (and are currently giving Intel a run for their money)
I don't know your budget, but if your going to buy into Ryzen, you'll need a motherboard that only supports DDR4 RAM, (your current motherboard uses DDR3) meaning you wont be able to keep using much of what you currently have. Although your GPU, PSU, and Storage devices are still good and can easily be carried over to this possible upgrade.
below is a list on PC Parts Picker that shows some of your current parts (to the best I can guess, I don't know what brands), along with the parts i would suggest getting.
i.e, It is what your build should look like when you're done with it. the PC below should run just about anything at 60 FPS on Med-High settings, and maybe even 120FPS depending on the game (LOL will probably reach 126fps on MAX settings with this build)
if you have a budget, or are just daydreaming, feel free to change the list how you see fit, or correct any mistakes Ive made about your current parts
https://pcpartpicker.com/list/7HbHWb
Otherwise, I would just get any i3 or i5 Intel CPU that fits your motherboard. if you would like a complete list of compatible CPUs for your current motherboard, here you go:
https://www.asrock.com/mb/Intel/H81M-DGS R2.0/index.asp#CPU
just click on "Support" and then "CPU Support list"