If you’re asking this question seriously, and not for your own amusement:
First, you need to talk to your doctor. Make an appointment with your GP, and tell them the things you’ve told us. Especially:
- Two herniated spinal discs;
- Waking up with new bruises (and when this began);
- ‘Feeling the need to pray relentlessly’ (this might point to obsessive-compulsive disorder, or another psychological condition);
- Frequent sleep paralysis and terrible nightmares;
- Hearing things (voices, and a piano playing), and seeing things (‘a shadow around the house’) (This might point to schizophrenia or another mental health issue that involves audio/visual hallucinations; alternately, are you on any medications that might impact your perceptions or mental health?);
- Maybe mention the fact that things get moved in your house during the night (e.g. your rosary on the floor in a locked room, your dad’s paintings changed around), in case there’s any chance you unknowingly sleepwalk.
Everything you have described is potentially attributable to one or more medical conditions (plus potentially other factors, like vibrations from a truck outside shifting things inside the house, etc). If medical, it is common for certain medical conditions to emerge during the teenage years – or you may have something that precedes puberty. It would not be anything to be ashamed of if you find you are experiencing a medical condition, including if this involves mental health issues: these would simply be something to manage, through medical means, as part of your walk in this life. Everyone has something. (My aunt has schizophrenia. It’s manageable.)
Since you express concerns that there may be a spiritual element to your experiences, by all means, contact your local priest (whoever is the priest at your local parish, closest to your house, should do fine. You can email him, or show up in person, to request a meeting to chat).
But do not be surprised if (when) the priest’s first suggestion is for you to consult a doctor of some kind, rather than immediately reaching out to an exorcist. An exorcist may be available if that is ultimately an appropriate action to take – but the vast majority of the time people suspect they are being victimized by demonic oppression, there are other factors (especially medical) that need to be explored first, and often explain (and resolve) the situation to everyone’s satisfaction.
God bless you! I hope you reach out to appropriate medical professionals (and your local priest), and ultimately find the help you need, whatever that turns out to be.