Avoiding Sex, Need Advice

I know the title may seem offish. However, I have been struggling to get any kind of arousal with my husband. Don’t get me wrong, I love him, Im not cheating on him, and he does a great job every time. I feel as I do a great job myself. We both enjoy our sex lives enough to have a high sex drive. If anything, I really miss it and I really want to have sex with him. When we first started dating, I was a little worried that his family would hear us. We were a lot skinnier at the time so I felt that we were actually pretty silent and no one heard us. A few years has passed and we are now married. We are not as skinny as we used to be and I feel as though it has gotten louder. His sisters have mentioned to us that they can hear everything behind these walls without directly telling us that its about the sex. If anything, they mention that they can hear us talk, laugh, watch movies, basically everything. So, this immediately turned me off. We are both actively in college and trying our best to get a career so getting a house has been rather hard for us. Especially since we pay out of state tuition for my husband since he is not a US Citizen. It’s been hard on him and I can tell. I told him how I felt and he understands. However, it doesnt mean that his frusatrations disappear. It doesnt mean that mines disappear. I have heard about sound proofing the room but seeing as money is already tight with college, we dont see it as worth it. I dont know what to do. I was hoping to get advice or see if I am the only one going through something like this. In the end I just feel guilty. His family hears us and gives me the disgusted look and I feel uncomfortable or I neglect my husband. I hate both options. Especially since I feel vulnerable when others can hear me. Please let me know your thoughts