Hi, and thank you! Im glad you're having fun with the game.
To answer your question: your first 2 weapons (as well as armor and shield) do not count towards your inventory. They have their own section on the character sheet. If you wanted to hold more than 2 weapons, the additional ones would take up inventory space
If you use an item, its only destroyed if using that item would break or deplete it somehow. Otherwise its yours to keep!