Is it normal to want to tell him that i love him?

I am in love with my best friend. I am 18, he's 17 (3 months younger) and he's my entire life. Next year when I'll be going to Uni in Switzerland, it will break my heart. I know that for sure.
We've grown up together, I've known him for 17 years now and I can't imagine a life without him. He's the only person I would trust with my life without any question.
Last year he told me that he's in love with me and I blew him off (gently). I was under the perception, that I couldn't fall in love with him because he's my best friend. Then I didn't hear from him for 4 entire months and I realized how much I had been taking him for granted and realized that I loved him. His mom then called to tell me that he was in an accident. I felt like my heart stopped beating or the world would come to an end. She said that he wanted to call me, but currently was in no state to take any calls, but he wanted me to know that he did not forget me. Two days later his grandfather died I called him until he'd pick up. We never talked about his love confession but we talked and he told me that he was thankful to have a friend like me. After that we were together as best friends again.
Then in the summer I went to Cape Cod and it was literally the most breathtakingly beautiful view I had ever seen. Standing there I only wanted to share the moment with one person; him.
That was the point from which on I started to fall in love with him. When I saw him the next time, I said nothing keeping my feelings locked inside, because I was convinced that they would pass.
Weeks later he bought me a StarBucks Coffee mug, because he knows I love coffee. He gave it to me telling me "So you can think about me every single day. Promise me."
And I promised it to him and kept my promise until today. I use that damn thing every single day, it's almost gross. seriously.
That was like this one moment, where I just thought 'He's not over me'.
this christmas, we decided to go crazy and go to the gym, to make it an unforgettable christmas. I had an accident and injured my leg, and he went with me to the hospital. Stayed with me there and didn't leave my side. I was super thankful of course and that was the point when I realized that I could no longer keep my true feelings locked away. I knew that I have to tell him.
I know that I really do love him with all my heart and that it is not just a crush.
The thing is, we're both seniors at schools where nervous breakdowns, sleep disorders and loads of Red Bull to survive the ordeal is normal.
We're both super busy and although I'd like to be in a relationship with him, I know that we both don't really have time.
I just want him to know how I really feel about him.
Is it normal that I want to tell him?