Addons don't load when I'm online

Whenever I go on Garry’s Mod, no addons load, and the addons menu says that I am not subscribed to anything. However, if I play Steam offline, I have everything. However, when I’m playing offline, all of my addons are enabled, and since I can’t disable them, since none of them are shown on the addons menu, and that can mess up my game when some addons don’t work together.