Is the bank always take win?

Why I have the feeling I am earning the pennies and the bank taking majority of my profits. I mean the bank is the platform we use for transactions. Either of these companies are just getting more wealthy but those stocks are looking struggling also if I wonder to invest in.. but they would take the profits from their too.. I’m talking about spreads and the fees to buy and to sell also those I don’t even know about. Which for holding in term , and what ever I feel very little with my greedy play style I feel never ending battle will always taken by the bank.. is this always use to be like this? Or I’m just using the wrong platforms? I mean it all the same kinda. More or less promise what ever takes you open an account to let you win a little but they just take huge amounts I can’t even imagine… little fish will be eaten buy a bigger fish.. okay that how is it working I see. I want to be the one starting to do something at least open an other account.. lol 😂 not I mean that money isn’t too much they getting out of my investments? is like 20% or how much? Buying those stocks which are volatile because of course I’m new to investing and I only know about apple and nvid also Tesla just those you definitely not going to win a huge amount.. of course I didn’t mention I’m very poor and don’t have a fortune to invest so I can only buy less then 1 share.. maybe I think margin and of course more fees combined even bigger lost from my winning. is it like clear plan to do that?as company owner I feel like you are the top of the chain is the bank again and I am still running around like mouse in the round thing… and they trough me sometimes breaks but even I running around I generate power for they machines to run they business..
Maybe I just feel the word against me to much..?