The answer to 'why is my mosquito bites' is that mosquito bites are caused by the female mosquito feeding on your blood. When a mosquito bites, it injects saliva into your skin which can cause an allergic reaction, resulting in itchy, red bumps. Mosquito bites are common and usually harmless, but they can be annoying and uncomfortable.
There are several factors that can contribute to mosquito bites, including the time of day (mosquitoes are most active at dawn and dusk), your location (some areas have more mosquitoes than others), and your personal attractiveness to mosquitoes (some people produce more of the chemicals that attract mosquitoes).