youtube will always compress the quality of your videos, they will always look worse on youtube then they do straight out of premiere but it shouldn't mess with the resolution size or frame rate, are you sure you allowed it proper time to process on youtube, (it takes longer to process 1080p60fps) usually even when a video is "done processing" it can still take a few hours for youtube to fully process the video[DOUBLEPOST=1453361736][/DOUBLEPOST]btw as far as export settings in adobe premiere, i use,
format: h.264
preset: (custom) YouTube 1080p60fps
resolution: 1920 x 1080
frame rate: 60 (59.94 also works)
aspect: square pixels
profile: high
Level 4.2
bitrate encoding: VBR, 2 pass (super important that you use 2 pass)
target bitrate: 16mbps
max bit rate: 62.5mbps (basically slider all the way to the right)
DO NOT worry about the check box called "Use Maximum Render Quality" you will not notice the difference in quality in most videos, but it will take much longer to render.
Feel free to ask me any other sort of questions about editing I've taken many classes and learned a lot on my own from online, just because im really into video/photo/audio quality, im always trying to improve mine. However I am by no means a professional just an enthusiast so theres definitely a lot of people out there who know more then me.