You are quietly seated on the terrace, the evening is mild, everyone is enjoying themselves... And the next day, it's always the same thing: you count the injections while the others have nothing. Injustice? Not at all. If the mosquitoes seem to have targeted you, it's neither a coincidence nor a bad luck. Your body is simply sending signals that they are very sensitive to.
Mosquitoes never bite randomly

First thing to know: only females bite, because they need blood to ensure their reproduction. And over the course of evolution, they have developed a radar that is extremely effective in identifying the best "targets".
Each human being gives off a unique combination of chemical and thermal signals. Some people are, in spite of themselves, much more visible than others.