Is my brother insecure?

He judges my lifestyle. I'm 17 and don't plan on having kids. He says that's stupid because humans are supposed to have kids. He's 19 and doesn't have a job and he has a 6 month year old daughter. His girlfriend has two jobs so she's the one paying rent. I also want to go to college and he tells me the degree I want, 3D animation, is stupid because it doesn't benefit society. Recently he's been putting down cops and saying things like, "F** the police." But now he wants to become a cop and go to school. A few weeks ago he was saying how he wants to go to church but now he thinks that religion is a joke and anyone who believes in God is crazy. I take offense because I know people who believe in God and they are not crazy.He thinks that his way of thinking is correct and he's right about everything. Basically, he's a know-it-all. My mom tells me to not let it bother me but it does. He makes me feel like crap since everything I say he tells me I'm wrong. Is that insecurity on his part? And how do I deal with it. I suffer from low self esteem and I'm working on it. I take people's comments to heart and it makes me depressed. :/

Everyone on some level is insecure, If you're brother is being negative all the time, perhaps it is wise to minimize your contact with him, and focus more on people who make you feel positive. Chances are, he is probably feeling as bad as you are, that is probably the reason for his brash actions.

It does not matter whether your brother is insecure or not; you need to look to your own future and what you want. It does not sound like you agree with what your brother says and know him to be wrong and in trouble, what with no job and supposed to be acting responsibly as a father. It could be he reminds you of your father, being the "next" person in that line. He is not your father and not any wiser or more experienced than you are, being only 2 years older than you. I would pay attention to your mother who has been around and seen/done more than your brother, if you are going to take anyone's advice or feel good or bad about yourself just from someone else's say-so?

I would go to college and see if you can meet other guys like you and get an apartment together with them or at least hang with them instead of being around your brother and his ignorance? Just say something like, "What do you know? You're only 2 years older than I am!" and walk away from him when he has an opinion you don't agree with.