My best friend doesn't feel the same

Me and my current best friend have been close for about a year now, we are both girls and nearly 16 for context. She is not a very affectionate person, and sometimes I feel as though I am boring her or she doesn't want to spend time with me. Our mutual friend recently let slip that she said she feels I am putting 100% into our friendship and she doesn't necessarily want to do the same, however we often get a long extremely well, spend hours talking and laughing and enjoy each others company. When the mutual friend told me this I felt as bit needy and pathetic, as though I am putting os much effort into something that my best friend only chooses when to put in the effort. I do not want to lose her and im sure that she feels the same as we get a long extremely well, and if I drift from her I am scared that I will and that I won't find another friend that I will click with as well as we click.