I've been thinking!>!?!!???

So.....I have been a christian for about 1 year now. That is good news! I have led some of my family to christ, and some of my friends. I have found a beautiful, smart, strong women of God. I have so many new friends that help me stay in line....help me grow...help me be a better friend, boyfriend, man of God. There are so many changes that I could talk about. So many new doors that have been opened. God is amazing...there is no question about that. His grace has made my life possible....worthy...
and presentable. I'm excited about all of this...and even more excited about the things to come. Here is what is bothering me. There are things, people from my past that I have to let go of, keep at a distance. I understand the importance of this in order for me to grow. There are some things, people that I can't seem to find the courage or the reason why I should. The problem is, they are great friends, people that are being corrupted by bad company just like I was. They may or may not know the Good News. They may or may not have experienced Christ and his Loving Grace. My question is how do I know who/what to let go of. They may need me, I may be there only hope. I want to be able be apart of their lives, I might have what they need. I have so many different friends from different situations. People that would do anything for me. How could I just give up on them.? I am involved in a whole community of Motocross racers and their families. Do I walk away from those relationships? Those people who wouldn't walk away from me? Where do I spend my time, who do I spend it with. I have all of these concerns, day in and day out. I would go crazy with a simple life......but maybe this life is a little to crazy. I feel like I'm spinning in circles trying to catch a glimpse of all that goes by. Hoping to make a difference in all that I see.