Stressing over my relationship

Okay so I'm 19, my boyfriend is 23 and we recently moved in together 3 months ago. I deeply miss my family and mostly my mother and things just aren't the same living with him. My stress level is higher and although he makes me very happy at times, it's like he uses my past against me and everything I do is not up to his par. It's my first time being in such a serious relationship and it's hard for me. I feel so confused at times and to get away I shower for about 2 hours to get my tears out and try to be happy. I have a lot in my plate at this point in my life, I'm in my second semester of college and I have a full time job in the city. I'm not sure what to do.