Guilt - a realization that what you said, did, or otherwise enacted was not in the good for yourself or others.
Shame - a realization that you are broken, something is wrong with you, you have less value than others because of what you are or what you said or what you did
Please, we are all sinners and have made some bad choices even while making the choice being fully aware that we are making the wrong choice, your experience is not unique to you, I’d say a few other billion people feel and experience what you do.
Guilt - great, feel it, it will work with your repentance and fuel your penance
Shame - how can you be shameful of the existence that God provided for you? Your body? Your mind? Your soul? How can God’s image and likeness in you ever be broken or valued less?
What will help ease the guilt is 2 things … make a good act of contrition during your daily prayers … make full intentions of making it to the next possible confession … did I say 2? … keep going to Mass, if you haven’t made it to confession, go to the Priest during communion and cross your arms and get a blessing! In my personal experience, when I have sin on my soul and I can’t receive the eucharist, Oh, Em, Gee … it’s like being locked out of your house, in the cold, with barely a bathrobe on, and raining, the only thing you want to do is get back in the house (by going to confession and making things right with God).
In sin, okay to feel guilt, but try to stay away from shame, my 2¢