Struggling with infrequent bowl movements - every 3 days or so but very little poo and comes out in little irregular shaped pieces. no bleeding.

Constipation: In a young person, serious problems are rarely found. I would suggest trying an over-the-counter product called MiraLAX. Generic version is polyethylene glycol. You might try it daily at first, then may only need it once every few days to maintain a normal pattern. This is a tasteless powder that can be added to almost any beverage. Including water.

Scyballous stool: This is constipation. Bristol stool chart type 1. Need more fiber, fluid, potential diet change and stool softeners.