Dealing with high sales costs (deposit) Comdirect

Hello everyone. After years of saving for my savings plans at Comdirect and saving for various stocks, ETFs and funds, I noticed during a conversation with a friend how damn high the costs are for selling my stocks etc.?! I like to be over 10%! Is this normal with Comdirect? And to learn from that, how do you do that? Or do all banks want that much for sales (except TradeRepublic)? VG! submitted by /u/LazyHazy22