Don't look small, looks healthy and cared for. Its not a race unless you grow autos. Nothing you have done wrong, try not compare your work to that of others, focus on what you grow then next grow look to improve an area where you feel you could Improve. Everything looks tickety boo, good stuff. That's alot of plants for a new grower make sure to keep as detailed a diary as you can going forward incase you need assistance later in the grow it can help other growers alot with diagnosis.
Good luck 👍 💓 ✨️