I am basically the same way right now. It feels good to have someone take interest in your life.
I guess i never really thought about how lucky I am to have a Best Friend like I do. We talk about everything, its so open. We joke sometimes that we are like teenage girls talking about all their problems. hahah.
But i really feels to good to be able to say anything and just get it out no matter how stupid or deep the question is.
I think that it will change as you get older. Right now your parents don't see you brother much because he is gone (i am guessing he goes to uni in another city or state).
I know this is not true but right now your parents are basically like "meh, i don't need to show interest in my sons life (you), he is at that stage were his parents aren't important anymore"
Or it could be like that old saying "you don't know what you have until its gone". Meaning that your parents won't fully appreciate you untill you left for like "summer camp" for example and came back.
You honestly need to talk to them about it, because parents don't realize that teenagers nowadays have that stage in there early teens were they "hate" there parents then later on around 16,17, 18, we start to appreciate them. Parents just can't tell when you change from the "hate" zone to the "caring zone"
talking to them will really help