Hey!
Looking at your specs, you should be able to play Minecraft. I have very similar specs and I get 250 FPS (with OptiFine). Just because you have an older PC doesn't mean that Minecraft cannot run on your system. My laptop is a 2011/2012 MacBook Pro and it runs Minecraft perfectly fine, so in theory this shouldn't be the issue. With that being said, I've listed a few things that could help, if it doesn't work, reply!
- Download OptiFine. This will really improve your FPS, plus any existing issues.
- Uninstall Minecraft. If you uninstall the game and then re-install it, this could fix some of the issues.
- Restart your computer. Sometimes a quick restart fixes some of your issues.
If none of that works, please feel free to PM me or reply to this comment. I'd love to help!