I'm planning to give this letter to him. Should I give it to him before the date which is this weekend so that way after when he read this letter there might be a chance I'll be on his mind? Or should I give it to him before this school year ends? And what do you think about this letter? By the way we're not together yet. He said he likes me too but isn't ready for a relationship and I told him I'll wait for him. :)
Dear XXXXX,
Ever since I met you, you made a difference in my life. You made me love myself even more. I cherish every moment when we're together. All the laughs and smiles mean a lot to me. Remember awhile ago when we were walking to Starbucks and you were singing "Across The Universe", the part when you sang "nothing's gonna change my world" you made me tear up a little. This was the bracelet you told me that look like your's but you lost it. After you told me that, I think about you every time I look at it and give it a kiss. And now I want you to have it. You're very special to me XXXXX. <3
Love and care,
XXXXXX
P.S
We should go on more dates<3

I think you should go for it. Give him the letter as soon as you can. Why not? The worst that can come out of it is that the two of you won't be together and you're already not together so you've lived through the worst of it. This life is too short not to take chances. Give him the letter and never regret doing it, as they say 'It's better to regret the things that we have done, rather than the things that we haven't done.' Good luck!