How can I get better at acting without lessons?

act things out in front of a mirror or on video camera and critique yourself...do everything u can to improve your scene or monologue and you should see some improvements

Here is what I feel is needed to become a decent Actor/Actress Some of this will cost. Find every opportunity in your traveling distance that does Plays or Musicals. Check the schools and community groups as well as professional. Contact them and ask to be notified of any auditions. If you do not get a part, offer to help in any way (paint scenery, usher etc.) Just being around the production you will learn a lot. Study Dance, Music and Acting. You must be able to do at least one great and the others well enough to let the others work around you. Find classes or instructors that have produced talent. Work on your image. You have to be a go getter, with lots of confidence and at the same time come across as humble. Develop work ethics. Never be late. Never be absent. Always be attentive. Always show respect for others, even when you do not think they deserve it. If and when approached by a talent agent or agency. Check them out carefully. If you are too young to sign a contract, remember your parents will need to be very involved.

Make your own indie films on youtube XD

Make up a script, for several characters, choose a part for yourself ( the main part obv. lol ) Learn the script by heart, Perform it, without anyone else, react to the characters that are not there, - imagine! Or, if you are this type of person, pretend that you are in a film - your life is not your life, you are playing a character and reacting to the other actors around you ( your family/friends), i know this sounds odd, but it actually works, Good Luck!