Play Warwick against him. He'll poop on you early, but by level 5-6, tides begin to turn. Try tricking hes shield(by running up to him making him pop hes shield, if he dosnt, you just got a free q harass) - do that everytime he goes for a minion(Glacial shroud is a great item on ww, i'd say its mandatory for him earlygame)
As most shen's build hp, you benefit even more from it as ww. when hes low enough, call for your jungler or just solohandedly kill him. harass him hard with your q(while still tricking hes shield) then just combo him with Q + R + Ignite + Q(if hes low enough, its a sure kill.) Try not doing that with hes jungler nearby tho as it might be a bait.
And I'm sorry if you dont understand what i just wrote, im kinda on the go