Front squats are hard at first SC! DOn't get discouraged and don't think in percentages yet as that doesn't really matter. It's a different lift, it's like saying what percentage should your BTN be to your military. Everybody is different and has different issues with various lifts.
Where on your shoulders do they hurt? If your elbows are up properly, the bar should be resting on meat, not bone. Your front delts should be able to hold the weights you're starting with without pain.
Hang in there! They get a lot better as you go along.
I am Anton Zdravko Martin!
Best meet lifts: Sq 150 Kg (330 lb), Bench 120 Kg (264), DL 160 (352) @89 Kg (197)
Best gym lifts: Sq 375, Bench 280 (pause), DL 385 @205 or less
Goals beyond my wildest dreams, 600 Kg raw total, 200/160/240
Hack away at anything which isn't essential. Do what you love, and do it often. Fazc.
Everything competes for recovery so more assistance is not always the best idea. miked96