Why not check out this site to learn more about staying safe online and how to deal with problems you may face when either on your phone, tablet or laptop. - https://www.thinkuknow.co.uk/
CEOP are here to help and give you advice. You can make a report directly to them if something has happened online which has made you feel unsafe, scared or worried. This might be from someone you know in real life, or someone you have only ever met online.