Why won't your coach spar with you? Surely he can go light.. Pad work in a ring is good but it's not enough.
spend 50% of your time with your coach sparring, spend the other working technique, the rest of the week practice technique and CARDIO!!!
Do some kicking only sparring so you can get used to checking a kick and knowing when it's going to come. Definitely try and check kicks but you have to take opportunities if you want to win. I wouldn't want you throwing a low kick on a guy if it's not natural to you yet though, it'll be telegraphed and he'll check it.. throwing your whole body into a kick to have it checked REALLY HURTS and as your shins aren't conditioned could possibly spell the end of the fight right there. Best of luck dude, keep us updated.
Where abouts in Thailand are you?