I feel for you. Give it some time, and you will see more clearly.
I was in a similar position a couple of years ago...not the kind I thought I would marry, had a "positive" Istikhara (as in the dream-type, and what i thought I knew of hima nd his family), or so I thought.
Everything, including the whisper in my heart (which he called the shaytaan
) told me that something was just not right, and that I should give it time... it took a LONG time, before I could see the whole picture, and it just got more and more negative, alhamdulillah. I didnt end up marrying him, and ALHAMDULILLAH for that, I truly am so happy about it!
Now, I am not saying that yours will be negative. Just remember that Istikhara is the WHOLE picture. A dear sis from this board really helped me make sense of things back then, and one thing I still remember (after telling her about the situation), she said "Well, THAT is your Istikhara, all the negative feelings, all the lies, everything, THAT is your Istikhara answer!" And, yes, alhamdulillah, it was!
Be honest with your family, and more importantly with yourself, and please dont ignore any inner voices, they are there to help and guide you.
InshaAllah, I know everything will work out for the best for you. Continue with your duaas and Istikhara, and like I said, give it a little time, things will sort themselves out..
Ur in my prayers