It can be demoralising to get dropped if every time you go out on a club run you get dropped on hills, thats the bad news,
The good news is you can do some thing about it, dont just turn up and get dropped at the same hill every time, use that feeling of getting dropped to do some hill training, have proper rest and watch your diet between these hilly club runs, then what you will find is you may still get dropped at some point but you will stay with them for longer every time until you can keep up.
What i find on hilly club runs (when we sprint up some hills) is tbh its great to wait on the slower cyclists to get some recovery in, so dont worry about the club waiting on you, the faster the cyclist up the hills is perhaps the cyclist happiest to wait.