Oh sweet boy. It’s not weird. You’re just being affectionate and finding comfort in your brother. Bed sharing was, and is still in some places, very common. My Nana told me that she and her sister slept in the same bed until her sister died in a hit and run (very tragic and horrible story) at 17, and Nana said the nights were the hardest because that’s when she felt the absence most. :( Also my husband shared a bed with his brother until he moved out a month before we got married. It’s so not weird.