Hello. You have had a difficult life till now. Those who laugh at you cannot even begin to imagine how they would feel had they been in a similar situation. You need to remember that no one can judge another. If they do, it is because they are weak. It does not have anything to do with you.
Regarding your fear of riding bikes, it is important to deal with it in a step wise manner. Join a driver training school. Read the rules. Help yourself to get out of this fear.
Next Steps
You may benefit from seeing a counsellor.