Hello Jess and welcome to the forums.
This is a caring, friendly , supportive and nonjudgmental place that is full of kind people.
I am sorry you are feeling like this and the pain of not being loved by your friend the way you love this friend would be causing you so much hurt.
Not being loved the way you want to be loved, will hurt at any age.
I can understand you are someone who feels emotions deeply and while he enjoys being friends with you and has feelings for you they are not the same you have.
I have been in a similar situation as you, and am sure many reading this will relate to your post too.
I suppose time is the only thing that helped me and talking to people who understood. It is an awful feel to feel you have all these strong emotions that are not returned. It can happen at any age, the first time I was in my early 20s and the last time in my 50s. People told me then I was too old to be upset by my feelings!
Would you consider ringing Relationships Australia 1300 264 377 and you could talk to a trained person about how you feel.
I am glad you made your first post and feel free to post here as often as you like.