Stash Newbie Issue

So I just started playing the game last month and I've slowly worked my way up to level 28. I wasn't paying attention and my stash is now full. I've scrapped or sold all the food, weapons, and armor I don't need. I've taken my extra ammo to an ammo converter machine. I cant add anything else to my vending machine because its full. Some of the weight seems to be in the power armor pieces I've picked up and weapons I'm not high enough level to use. Dont want to part with them if I dont have to. Any advice would be nice.