I like him... He likes me.. But It's awkward when we try to talk?

We both just recently found out we like eachother.. But, it’s so awkward when we talk..! Not only that.. We can barely look at eachother anymore.. We used to be like brother and sister but now, it’s like whenever we see eachother we have to avert our eyes or something to that effect and if we do try talking he walks up to me inside our highschool and asks smiling awkwardly “Um…. H-how’s the weather…?” which I return with.. “The weather is.. GREAT in here….~” (And then we both start laughing nervously and end our conversation)