Minecraft hates me...

Hello! I have seemed to notice that, most of the new updates are most likely to be all fixed bugs. But I have a new bug to tell! Are you excited!? Almost ALL Minecraft users download skins from the internet, right? But when I try to select my downloaded skin, it seems like Minecraft doesn't want me to use the skin. Basically, I'm stuck with the same old skin I used months and months ago. I REALLY love Minecraft and I wish you guys could fix it... I'd play Minecraft almost the whole day! ( I know it's not healthy, but still) I really wish you guys can fix this... it would really help me more with playing.  have a good day!