It's normal to get down on yourself sometimes -- everyone does it. But when you have ADHD (attention deficit hyperactivity disorder), you can get caught up in patterns of negative thinking. Thoughts like "I'm stupid" or "I'm a failure" get stuck in your head. It's hard to break out of that cycle, but there are a few tricks that can help you think more positively.

Some negative thoughts come from inside you. Anxiety and low self-esteem are common in people with ADHD. You may worry that you aren't good enough or that you'll fail. Negativity also comes from outside -- parents and others who criticize you for behaviors you can't control. Here are a few strategies to transform negative thoughts into positive ones and boost your self-esteem in the process.

Meditation is one way to steer your mind away from negative thoughts when they creep in. There are different kinds of meditation. In mindfulness meditation, you breathe deeply in and out while focusing your mind on the rhythm of your breath. When any stray thoughts drift in, let them float away like clouds. Meditating is good for managing anxiety, depression, and ADHD symptoms.

When you feel down, flip the script and focus on your strengths and successes instead of your failures. Even small wins count. Did you get an A on your math test? Can you sing your favorite song in tune? Think about all the things you've achieved and give yourself credit for them. If you can't think of anything on your own, ask your parents, friends, or teachers to highlight something you do really well.

Negative thoughts often take hold during stressful times. An upcoming test or class presentation can set them in motion. Find better ways to cope with life's challenges. Meditate, listen to your favorite songs, scribble your frustrations in a journal, burn off stress on the treadmill or basketball court, or escape to your room for some chill time. Try different methods until you find the ones that work for you.

Sometimes you need a cheerleader or two to get you out of your funk. More people probably have your back than you think, and a little praise can do wonders for your self-esteem. Ask your parents what they love most about you. Find out what your friends and teachers think you do best. Through this exercise, you'll start to discover your own superpowers.

Affirmations are positive statements that help challenge negative thoughts and build self-esteem. Examples of affirmations are: "I can do whatever I try to do." "I believe in myself." "I deserve to be happy." Repeat these words to yourself in the mirror or while you meditate. Write them on cards and post them where you’ll often see them. Use your affirmations whenever you're having a bad day to try to stay positive.

Cognitive behavioral therapy, also called talk therapy, is a treatment for negative thinking. It also helps with anxiety and depression. You work with a therapist one-on-one to identify the negative thoughts that are holding you back. Then you learn how to change those thoughts and find more positive ways to deal with the problems you face.

When you're trying to get something done, it can feel like there's a huge mountain standing in your way. Conquering that mountain starts with a single step, but you need motivation to move you forward. One way to motivate yourself is by focusing on your skills and interests. If you're an artist, draw doodles of your plan. If you're a musician, write a song. Celebrate each small success to push yourself forward.

If you're struggling, it probably means that you need help. Don't be afraid to ask for it. You could ask your teacher for more time to do assignments or for extra breaks during the day. Ask your parents for help with your homework or to get you special apps to help with time management and organization. Asking for help can be hard to do at first, but getting that support can come as a big relief.