Although your intentions and feelings are probabaly innocent and pure, you come across as pretty intense in your feelings for her. My friendly advice is to try to tone it down a bit. The part when you state 'I don't know if I can count you as a cousin, because you're sooo much more than a cousin to me' was unecessary.
I would say you have attachment issues from all the things you have told us on the forum and the way you write to her. You're a very emotional person (are you male or female? cos your attachement seems to focus on women primarily)..I'm not saying there is something wronge with being emotional like you are but you will experience a lot of disappointments and abandonment by wearing your heart on your sleeve like you are...
Find an outlet for all these emotions: theatre, sport, a bfriend/gfriend/ a pet (!)/ a support group/ a therapist/ a priest/art/writing...
Again nothing wrong with being sensitive but people will step back if you come across as too needy and clingy...