So heres a couple things you never thought about in this situation as you should.
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Your to young for him when he turns 18 years old you will only be 15 years old if anyone in the public found out he would be behind bars. Cause the state can press charges even if both parties and parents were accepting of the relationship. That will tarnish his name for a life time by the way.
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I think your confusing a normal friendship for a romantic one cause everything you have mentioned has nothing thats romantic in anyway shape or form. You also said you don’t know if he feels the same way so your assuming hes into you and wants to date you. When in reality he could be opening up to you cause he sees you as a little brother thats going through the same things he is.
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Also if he is into you thats kind of a red flag don’t you think? I mean in laymen terms your just barely a teenager. I can also guarantee that your parents wouldn't be so keen on you dating someone 3 years older then you.
I think you should spend more time having a friend you can count on like him and go through life a little more to know what you want and all that before you jump to dating so fast. Also another thing you need to think about is most first time relationships don’t last forever in fact only 1 percent do. Most first time things don’t last long. So decide if you want this guy in your life for as long as possible of if you want him not in your life cause you got ahead of yourself.