1 Timothy 4:12 says: "Don’t let anyone think less of you because you are young. Be an example to all believers in what you say, in the way you live, in your love, your faith, and your purity."
This verse is basically saying to not let other people think less of you, or look down on you, because you're young.
Instead, you should be an example to those people, in what you say, in the way you live, in your love, your faith, and your purity.
Philippians 4:13 says: "For I can do everything through Christ, who gives me strength."
You can do all things through Christ who gives you strength.
Don't let other people look down on you and make you fell like you can't.