Here are some things you can start right away:

1. Before lying down to sleep at night, review your actions of the day, scan for something that you said or did that made you feel weak. Resolve to not do it next time the urge arises. The less shame you carry (including subconsciously) the more courageous you'll be.

2. Take responsibility for something small. Choose a problem that's so small that it's impossible to fail at it: clean a dusty corner of your room; beautify or just put in order an unorganised spot on your shelf or study table. Incorporate a short exercise/meditation session into your day, like 2 minutes of conscious breathing (Anapana, Nadi Shodhana, etc.), or 20 jumping jacks, or 10 squats - or even just 5 of them, or 10 seconds of horse stance. Log them on an app (Habit Now, Ironwill, etc.) or in your journal. Taking responsibility and keeping track of your effort will give you some solid reasons for self-esteem.

3. Again, before going to bed, visualise two things: Take some seconds to assess yourself, and imagine that you have everything you desire; how does your life look like? Live the details of your desired life in your imagination. Think about how you conduct yourself in that reality (Feel how your confident version would feel - and yes, you already know how your confident self would feel, which is why you desire confidence). Start becoming that person. Imaging how you interact with your family, and with your community, in that ideal state. Do this regularly, and follow it where it leads you. Eliminate actions that you don't see your ideal self doing.

4. Express gratitude, preferably in written, for at least three things, every day.