Fear can really ruin a person. Don't be afraid. Just do it. Even if it means doing it alone. Don't be afraid of being alone in a crowd because it will not last forever. The decision you're going to make, that thing you're afraid to do might just be the best thing you ever went ahead and did in your life.
There are honest words from me and speak from experience: No matter what happens, do not be afraid. God is with you wherever you go, and with his strength, you can do anything.