@Drxpy if your game was already crashing on startup before downloading mods, it certainly won't get fixed by installing mods. Remove your mods and do a verify integrity or reinstall if that doesn’t fix your startup issues.

Once your GTA5 is stable, then you can install your mods, which are not installed correctly because if they were, then they would work, right?

So start with a working game and then reinstall, extracting files and placing them in the right folders. If you haven't done so already install OpenIV and create a mods folder.