Blurry Game Resolution Problem With TV Monitor (PLEASE HELP)!!

Hello, thank you for coming to my topic. I'm having an issue with my tv monitor, It's an Toshiba 32 inch 720p TV You can look up the model if you want https://www.google.com/search?q=toshiba+32c120u+resolutin&oq=toshiba+32c120u+resolutin&aqs=chrome..69i57j33.6207j0j7&sourceid=chrome&ie=UTF-8 . People say that this TV has a native resolution of 1366x768 relabeled to 720p. my display is very muddy when i play video games. Like Fortnite I put the resolution to 1280x720, and it looks very muddy, but i don't understand It should be crisp not blurry. 1366x768 isn't even available in Fortnite. I have to force my pc to run 1080p, so my tv can upscale to get crisp image. But i'm wasting precious FPS when i can just find my native resolution. My specs are

Amd FX 8120 3.9 GHZ Overclocked

Amd Radeon 7850 2 GB Vram

16 GB Ram

See my pc can't handle 1080p, that's why i got this toshiba TV. But it's blurry at native resolution. Please somebody tell me, is my Native Resolution 720p or 1366x768 Any answers are accepted. THX!

Everything except the native resolution will look blurry. Although 1366x768 and 1280x720 are both labeled 720p they're not the same obviously. And there might be another issue, not sure if it's present with 7850 and today's drivers, it's this stupid option called underscan. If you have it in your GPU settings you need to set it to 0. And of course you need to use HDMI, VGA is always a little blurry.