Mate, I know how you feel.
I have two friends, who seem to get along with each other and talk a lot more than they do with me; in fact, I don't know if I can even class them as friends anymore, they seemed to have just "forgotten" about me. Truth be told, I don't contact them as much as I should because of school work and such getting in the way, so maybe it's a bit like that for you, with being caught up playing basketball and whatnot, so try talking to them more. I know it can get tiring, and you may feel like you're running after nothing, but if you truly value they as your friends, you won't give up, right?
>>5 I agree with needing to communicate. They won't know how you're feeling if you don't tell them.
It's always hard when it seems like you've become a third wheel, I know. But that's why the dollars are here, to give you that support you need. <3