I feel very different? Thought patterns changing?

I am a 14 year old male, and lately, I've noticed my thought patterns have changed. I have just been feeling depressed, and disinterested, I seem to have lost my sense of humor to some degree, and I am questioning everything, including humor. I seem to have the attitude that everything humans do is bad and no matter what we're always going to be a stupid race. It's like I feel that we have to be serious 24/7. I also am questioning reality and the point of life. The smallest thing can set off a what-if questioning loop. This is distressing because up until now I've always dealt with reality. For some reason, I seem obsessed with knowing that the human race is good and everything we do is not bad. I am obsessed with being right and just and kind and not doing harm. Also, I am having illogical fears like, "Oh, we're hurting the environment and hurting it's spirit and creating bad energy" and "by walking on grass we're hurting it". I have retained logic and that seems to be helping me get through this. Is this a normal thing for teens to go through?