When your girlfriend won't introduce you as her boyfriend or tell her friends and family about you, she's signaling the relationship isn't real to her. She's keeping you separate on purpose, which means she's using you.
Sign number 2 that she's using you is that she doesn't want you to meet other people in her life. Or she purposefully avoids introducing you as her boyfriend. Maybe, "Oh, let's not tell everybody we're dating yet, but, you know, we're totally a thing, but let's not tell—" No. Why doesn't she want to tell people? Maybe she doesn't want you to meet her family or her friends. That's a key sign that she hasn't told them that you're dating because in her mind you're not. She's trying to keep a level of secrecy to keep your lives apart instead of together. That's a huge red flag that she's just using you, and she's incredibly out of line.
