thoughts and feelings

I feel so alone. I feel like no one understands. I miss being happy. I want to know God's will for my life, but i feel like it's so hard to find. How do I know if I am doing the right things? How do I know if I am on the right path? I feel guilty all of the time. I question everything I do and if it's ok with God and it's exhausting. I used to never feel this way. I used to just live my life and have fun. I want to live my life for God, completely, I truly do. I just don't want to feel guilty and question my every single move. I want friends who understand. I have a lot of friends, but I feel myself slipping away from them. It's not their fault of mine, I just don't identify with them as much anymore. I live my life for Christ and most of them don't and so it's just hard for them to understand. My dad died two years ago and my mom is not a Christian and that makes things hard too.