LostAngel, maybe your carrying 'guilt'. You have to accept that you have the right to say no to a marriage, and you did, your family supports you.
There are thousands of such cases in pakistan, where cousins dont like eachother, and engagements break off, families cut off ties etc. So dont take this to heart. Its part of being pakistani.
Second, with new year and all, make a new years resolution of getting help for your acne. Because how i see it is, your punishing yourself of not getting rid of your acne. You should stop feeling guilty for rejecting your cousin. Islam has given you that right, so im sure there is nothing wrong in it.
And your still young, you will inshallah find a man who will love you for you and will not stop you having a career.