Assuming first that there isn't a problem with your pressure tank (check it with a tire pressure gauge to check) and that your pump isn't underpowered for the depth of the well or the length of pipe it has to push the water to reach your house. You might want to check the pressure switch.
There is a pressure switch on attached to the plumbing between the well and the pressure tank that may be adjustable. However, beware of increasing the pressure, adding too much extra pressure can cause weak joints or older pipes to leak under the additional strain.
Another consideration is whether your problem is low pressure or low volume, the symptoms of both can be very similar the user of plumbing fixtures. Unfortunately the only good way to fix volume problems is to upgrade to larger pipes, which can be a major undertaking.