I have said this many times but probably another time will do no harm - please diffrentiate between real Church’s teachings/doctrines and individual Catholics. I understand it is difficult for you since you come to be taught Catholicism.
Devotion, which is practicing a certain spirituality in a devoted way, is not doctrine. It may be necessary for spiritual growth but it is not obligatory.
For example, as a way for spiritual growth, you can be devoted to the Eucharist by going for the mass everyday. That is a good thing. The teaching of the Church however, tells us that we are only obliged to go for the mass on Sundays and days of obligation. Similarly for other devotions. So hope you can see the differences. They are not obligatory.
Now, when you go into devotion, you can expect a deeper understanding of the subject that you are devoted to. The words used therefore have to be understood in the context they are used. This is the reason why non-Catholics would jump up at the terminologies we used because they understand it generally without knowing our context in using them.
As for Mary, for starter, it is enough for you to know that she is the mother of Jesus who is God. In that sense she is called the Mother of God. She does not have the power of God but basically her roles is intercessory (for us). Being an intercessor, she is special because being the mother of Jesus, she would be the closest to him as a mother does. Remember at Cana, only a mother can do that kind of thing to her child. And Jesus, like any good Jew is a good filial child. When we ask Mary, she will be on our side, and that would be to our advantage.