Be patient this is my advice, take things with more lightly I think your dad makes this just for your best maybe then with the time one day you will reach even your independence all depend from yourself; tries to listen my advice who has made too mistakes in the life; I am Italian so sorry for my english

Romans 12:1-2
I appeal to you therefore, brethren, by the mercies of God, to present your bodies as a living sacrifice, holy and acceptable to God, which is your spiritual worship. 2 Do not be conformed to this world but be transformed by the renewal of your mind, that you may prove what is the will of God, what is good and acceptable and perfect.

I don't know your age, but if old enough, I suggest that you get a job. It doesn't have to pay much or be fancy. Remain @ home, respect your parents and pray for them and the entire household. * Pay for your own internet service. Pay for your own computer.

Sorry, I can have bad reception, that's why I'm writing again, anyway! Don't rub anything in your dads face, but have the money to pay for your own needs. Get your own tablet or computer. New or second hand. It seems that you want to make something out of yourself, that's good! ** Internet service, along with your cell phone service, is only an additional $5.00 per month. Sometimes, its included for free! Do some research. Keep leaning on the lord. Peace & blessings

I won a computer but he now says it is not mine. To be honest what everyone here is saying is easy in words but I wonder how many will follow their own advice of "obey". It is not about obeying, it is about oppression. Oppression is not of God.

I understand how oppressive, intrusive, and violating your father's action must feel, and I agree your father could have approached what he feels to be a problem in a much better way.However, i also think it would be good for you as an adult to try and see things from your dad's perspective. You said he feels you are studying too much and even you mentioned the heaviness of your study load. So as a dad he may see something in you that you are missing. He may see or feel you are getting too stressed or missing out on love and life in your youth. He may be very concerned about you and felt words of caution would not help or change things for you so he just did what he thought was best for you and took actions in his own hands which of course only angered and frustrated you. I encourage you to talk to your dad and try to reach a compromise with him. Try to understand him and in a mature, calm way explain your feelings as well. Maybe you could agree on Sunday to take the Sabbath seriously and do no studying or work and just rest and enjoy. You could also agree to put all studying aside for mealtimes with the family. I think your dad probably loves and cares for you so don't resent him. Instead reach out and communicate with him ask for your computer back but assure him you will make an effort to balance your time to enjoy life and family as well.