We worry about so many things. We can worry about money or what others think about us or friendship or a particular situation. Try giving up worrying for Lent.
If it seems overwhelming, think of one particular worry you would like to give up. When you find it filling your mind, give it to the Lord and move to something else.
When you are struggling with this, consider this quote:
Trust in the Lord with all your heart and do not lean on your own understanding. –
Proverbs 3:5