I've been feeling I'm the main reason for climate change.
Why would you think you're the main reason for climate change?
Lol, probably by breathing too much
Kidding aside, it sounds like you have some understanding of the chemistry behind climate change. Hopefully you'll use that knowledge to curtail other, more pernicious CO2-emitting behaviors!
My teacher told me that we are all to blame for climate change. I take that seriously and speaking my mind.
It's good to take climate change seriously, but you shouldn't totally blame yourself for it. If you care this much about it I recommend looking into groups that could raise awareness for this.