Please talk with your mother, grandmother, an aunt, a teacher, a counselor, or a friend about these feelings. This is a vulnerable time in your development as a fatherless daughter. It's critical that you don't start heading down the wrong path. Looking for father love from a boyfriend would be doing just that.
It's very tempting to escape life's increasing challenges by attaching one's self to a guy. It's far easier than studying hard at school, joining clubs and extracurricular activities, competing in sports, building strong friendships, getting a part-time job, setting goals for yourself, and going about achieving them. Yet, these things are much more important to do because they build self-esteem. Then, when you're older and ready for a boyfriend, you'll have the confidence to pick a good one.
A teenage boyfriend cannot provide father love. Moreover, he would have no interest in being a father substitute nor would that be fair to expect that from him. Teenage boys want to hang out, decompress, have fun, and act silly. Some are interested in getting as far as they can with a girl sexually. That's the last thing you need in your life now.
Hopefully, you've had a man serve as a father figure since your dad's death: a grandfather, uncle, family friend, or coach. If so, tell him how you're feeling and ask to spend more time with him. Please don't keep these feelings bottled up inside you. Talk with someone you trust and respect.