So awkward

I'm 20 almost 21 and we have been trying now for a year. I have a baby face. Big time I look twelve not even kidding.. I promise Everytime I go buy a pregnancy test someone says something. Whether it's a oh no. Or going as far to ask if I need help. I understand that they are trying to be kind and helpful but it's very embarrassing for me. Anyone else's have this problem?