Check motivational videos, Mateusz M and others, as well as quotes. They do help, but motivation should mainly be internal, from your heart, rather than external from other sources. You gotta realize that this is what will make you grow, be different than others, this is what will make you different from the losers, quitters, haters, you have to to push through bad times through life. I have bad days too, I used to give up on the bad days but it's the mindset, it's if you want it bad enough. It's not like I don't want it to be some sort of magic thing where you don't work out and have good nutrition consistently and make gains, or pass exams without studying, everyone wants that, but that's not the reality, the reality is you gotta stand for what you want, work hard, make it a priority, stop giving in to your feelings, if you really want it you will be consistent bro. You don't have to be strict but you have to be consistent, at least 2x every muscle group per week, 3-4 is best with full body workouts.