Guys who had no interaction with women going into their 20s and who don't talk much, how did you get a girlfriend

Hi I'm 21M. I never really had much interaction with women not in school not in college. I'm not much of a talker and I have always had trouble making friends and making healthy bonds. I have a lot of emotional baggage because of my childhood and low self-esteem though this has gotten better these few years. I have have been told by many that I'm handsome and I'm in moderately good shape. Throughout my school years I never really had any interaction with girls (due to low self-esteem). In college I started to open up a little, did interact with few girls but that didn't go further any than acquaintances. Than I went for an internship became friends with some women there. By the way I have always trouble knowing if a girl was flirting with me and I'm can't flirt even a little bit. Now I started working at a hotel in reservations. My job doesn't allow much interaction with anyone so I haven't had any interaction with women here either. So what should be my action plan to get a girlfriend?