A long narrow bedroom can feel like an awkward space. Here are some tips that should help even out the proportions a little.
Paint the long walls in a pale, cool color, but paint one of the end walls in a bright, warm or dark color, to bring it forward and make the room feel 'squarer'. You could also try a bold patterned wallpaper on this wall. Horizontal stripes are a real help here.
I know it's tempting, but don't line all your furniture up against the long walls. Try to use the end walls more instead.
Use uplighters for your lighting, rather than downlighters. This will make the ceiling feel lighter and brighter, which will visually 'lift' it a little. Paint your ceiling a bright white, or at least a much lighter color than the walls.
I hope these ideas will help your bedroom feel a little less like a corridor.