Carrying capacity, as defined on page 176 of the PHB is:
Carrying Capacity. Your carrying capacity is your Strength score multiplied by 15. This is the weight (in pounds) that you can carry, which is high enough that most characters don’t usually have to worry about it.
My Kobold Barbarian has a 16 in strength, meaning he can carry up to 240 lbs encumbered or 80 lbs unencumbered. He currently is carrying a Greatsword, 2 Handaxes, 4 Javelins, 2 Scimitars, 2 Sheilds, and an Herbalism Kit, which all equates to 39 lbs total (all of which are the standard size for the item). I know I can carry everything, but how would the mechanics work, especially with the large size of all the gear opposed to my 2’6″ character