You say that you stay at home instead of going to Church, and want to know if you are sinning.
You are not sinning, but losing out on a benefit.
The benefit of meeting with others is to be a blessing to them, encouraging them, and praying with and for them. Jesus said two or three gathered together, brings His presence.
Here is what we read in Hebrews 10:24-5 "And let us consider one another to provoke unto love and to good works: Not forsaking the assembling of ourselves together, as the manner of some is; but exhorting one another: and so much the more, as ye see the day approaching".
I hope this will help you think through this matter.
You can watch church on TV anytime, tape it if you need to, but this does not give you the connection to people that you need in times of sorrow, need and doubt. The fellowship of Christians is a 'Two-Way' street.