Are you a PGY-2? If yes, of course it's horrendous! You have no idea what you're doing. It's a performance sport. Gotta practice before the attending gets there, turn your contours off and let them do theirs. Look at the difference. Ask them way theirs goes more lateral or is more expansive or whatever. Use the RTOG atlases. Read the seminal papers - there are for most sites. Contouring and field design should be very rational. Though there is art, the art should be millimeters, not centimeters. The art is whether to include a particular level of LN based on evidence, not necessarily how to contour it. There should be considerable overlap between attendings contours and what the atlas says (like 95 percent, otherwise they are doing it wrong).
It sucks your mentors are not helping you. I suggest you go to astro contouring sessions or other ones - UPMC does an IMRT contouring session with their physics company D3. Sign on to chartrounds.com and watch those cases. Btw, does anyone feel that there are way too many zebras on chartrounds? They should push for "normal" cases, too, just to make sure people know what the hell they are doing.