Should I, a 20-year-old male, break up with my girlfriend, who is 21 and with whom I've been together for two years?

I'm a 19-year-old male, and I've been considering ending my two-year relationship with my 20-year-old girlfriend. Here are my reasons: 1) To be honest, I can't envision a future marriage with her. She annoys me at times, which hurts to admit, but it's the truth. 2) One of the main reasons I'm still with her is that she provides support with my college work. While I could manage on my own, her help makes balancing school and my workload easier. 3) Her parents dislike me. I got into trouble during high school, and I’ve barely spoken to her dad and only exchanged a few words with her mom over the past two years. Her dad is quite withdrawn, and I rarely visit their home. 4) Her friends seem to have issues with me as well. I don’t understand why, but they spread rumors about me and act friendly only when she’s around. 5) I've had concerns about her loyalty. While I wonder if I'm just being insecure, I’ve found texts from her about missing other guys just six months into our relationship. She also maintains contact with several of her exes and spends about 16 hours a week on extracurricular activities, which sometimes involve questionable late-night disappearances. Additionally, her friends aren’t exactly a positive influence on her. On the flip side, here are some reasons I hesitate to break up: 1) We’re often seen as a power couple among our friends. 2) Her help with my schoolwork significantly reduces my stress and saves me a lot of time. 3) She is my only girlfriend, while she has had more than a dozen exes. 4) I talk to her frequently; although I don’t rely on her emotionally, losing her would impact my social life. 5) She has been a positive force in my life, helping me get sober and distancing me from bad influences. So, what should I do? **In Summary** I’m thinking of breaking up with my girlfriend of two years because I don’t see a future with her, her friends and family dislike me, and I suspect she may have been unfaithful. However, I also want to stay with her because she’s my main social connection, my only girlfriend, she’s helped me get sober, and she alleviates a lot of my stress. What should I do?