How can i start over?? i need like a new life or something..?

You lost an important family member, your father. Sorry to hear that. And things are happening to you that makes you unsure of yourself and the people around you. You don't want to get close to anyone because you feel, they might leave you. That's totally normal. It's Okay to retreat inside yourself when these types of things happen. You need time to yourself, time to reflect on things. We cut people off, maybe not purposely but that's the way we deal with things when they hurt us deeply. It's ones way of protecting ourselves when things happen that makes us unsure, insecure or sad. Now, you're ready to create happy memories and get back into the swing of things. You can start at your school and try to make some new friends. You can join a club, join the Y, The Boys and Girls Club or get involved in a play, a band, a sport or hobby. You can become social by saying, "Hi" and take if from there. You're not different, you just had to get over the emotional stuff that happened to you. That made you sad. Just relax and be yourself. Other people will understand and welcome you back into the fold. You are strong, you've grown and you will do well. Good Luck.