(sorry if I repeat anyone - havent read all posts)
Yea mate unless you get stuck flying in REALLY bad conditions or if its gusty and unstable during landing - I think your fear is unjustified, but that's ok, we all fear different things, usually irrationally, but the fear is there to protect us I suppose. It's just a shame that it could be affecting your enjoyment of flying.
If you are just flying around (not landing/t-o) then just 'ride' the bumps and enjoy them, the plane will Never fall out of the sky uncontrollably (unless as I said before you were flying during a storm or a big CB) plus with height, even if you did get tipped right over here then back there then up and down, you're not going to crash. I fly the lightest version of the drifters, a maxair XP and a butterfly flapping makes it jump around, honestly if one bump lifts the left wing I dont even correct it (unless I HAVE to) because I know that the very next bump will lift my right wing etc etc you get my point. I just float up the updrafts then sink merrily down the other side dont even move the stick or the throttle.......why fight the air and make life tough......we fly in an ever changing moving bubbling mass of air and unless you are in the circuit or maintaing specific height for a reason (i.e hemisph.) just RIDE the air and enjoy it!!!
Plus is it a lightwing you fly? They have incredible control authority all throughout the flight envelope the chances of a gust making you lose control would have to be the type of air that you should never have gone up into anyway..........I hope this helps, of course I am not an instructor but this is what was taught to me and I really want to help you because I used to be scared of bumps when I was younger but keep getting up there and youll find the bumps fun = not a good idea to be one of those fair weather only pilots who suddenly find themselves out of depth.....Hope this helps and I hope no one on this site is too harsh on me if they dissagree, but id love to hear.... Dave