I'm fake happy in life :(..?

I'm a 16 year old male in Florida. I've noticed that I'm truly not happy in life and I do not enjoy it. I always tell my friends I've living it up, but in reality I'm insecure and feel empty. I'm a pretty handsome kid but have never used it to my advantage, and do not have as many friends as I should have. Also, I always say I don't care what others think but I know I am lying to myself. I don't know if I'm depressed or not because there are some days where I love life, but the majority of the time I am bored. How can I truly let go of all my insecurites and learn to live life despite what others think?