loneliness

I feel so lonely and it gets me down so much. I'm 18 weeks. I have a boyfriend of 3 and half years, all his family support yet I feel like this. I never go out as I don't have friends of my own. I'm either at college or work. My boyfriend would rather go out with his friends drinking than spend time with me but he thinks that inviting me makes me feel better but I don't want to go out until early hours whilst everybody gets drunk and I'm looking like a lemon. I just feel really sad