@Cupcake18 don't feel sorry that you are not motivated enough. I don't think there is a single student out there who has never had this feeling. But how did they manage to get out of that ?
If you ask me, I got inspired. You see, motivation is short lived. It's inspiration that will make you keep going in the long run. Find someone or something that motivates you. It could be anybody, a politician, sportsperson, business person anyone. Read about them. No one has had it easy in life. So read about their struggles. Get inspired by them.
When you feel a little bit of energy, sit down and think. Visualise how your life is going to be of you just hustle a little bit. What is it that you really want? If you don't do your work now, will you be able to get it? If the answer is no, then start working.It's going to difficult.
But no one is asking you to put 12 hours in it. Start small. Focus on your work for 30 minutes straight. Leave your phone. After 30 minutes take a short break and do something you really live. Keep repeating this cycle and eventually you will start enjoying it.
Always lean on your ''Why'' power. Why are you doing this. Why are you studying. Why is it necessary. Once you start asking yourself these questions, it becomes easier to motivate yourself. Hope it helps.