Doomed

Despite how crazy I feel about my new girlfriend, I cant help but feel that our relationship is doomed. A myriad tiny clues lead me to the feeling that we have a time limit. I am worried that we have 8 to 12 months, and by that time it will be over. I don't want this to happen but the feeling persists. What I have to remember is to not make it a self fulfilling prophecy. If I were to act like we had a time limit then I would be the one limiting the relationship, and I don't want that.