Is it just the shower and not the sink faucet? What is the water pressure in your house? If you don't know, buy a 10 dollar pressure gauge from Amazon and attach it to an outside hose bibb. Mine is 60 psi and I have a 2.5 GPM shower head and the pressure is fine.
The maximum legal flow rate for shower heads is 2.5 GPM. Don't buy one with a lower flow rate. Some people will modify the shower head to allow more flow, but you shouldn't need to. If these things seem okay, you may have a problem with your shower mixing valve. That would probably require a plumber.
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