Demotivated

After envying many posts on here, I recently tried to fill my 35l Eastpak with 1 weeks worth of clothes (including going out shirts and shoes) and it was just too tight, especially if I wanted to take a second pair of sneakers to switch for sightseeing during the day.

It was a bit demotivating having to purchase the addon hand luggage. I might have not packed as efficiently as possible, even taking into account doing laundry once.

One excuse I have is that clothes and shoes with me being extremely tall are far too big for a backpack.

Appreciate any tips... Or words of positivity so I can fit everything in one next time