Here’s a good (and classic) reminder of what Jesus has done for us (from The Institutes):

If you contemplate yourself, that is sure damnation. But since Christ has been so imparted to you with all his benefits that all his things are made yours, that you are made a member of him, indeed one with him, his righteousness overwhelms your sins; his salvation wipes out your condemnation; with his worthiness he intercedes that your unworthiness may not come before God’s sight.