I am 20 years old that is a full time student that lives with her?
Respect her by apologizing, and tell her that you understand she feels disrespected in many ways, especially because of you lying. Offer that you won't do it again, then don't do it. Grow up. If you have a date or want to go out, tell her your plans and agree to be home early, say midnight, or you will stay in a motel or with friends to respect her wishes and home by not coming in late and half lit. You are still acting like a child if you can't work out an agreement for you to have adult activities, while living in her home. Paying the bills and having a job are just part of being a mature adult. These days many young adults have roommates, or rent a room, and these situations demand you to follow the rules, or discuss your needs, and make arrangements that take others needs into consideration. If all your roomies, or home owner work at six am, they are not going to appreciate you dragging in at 230am, and may see to your eviction. Another major point is that your mom loves and cares about you, letting her know when and where you are going shows respect for that love, as well as provides you some insurance if you run into trouble. In the event of you going missing, the chances of your survival are better if someone knows your itinerary, be it your mom or roommate.