It's ABSOLUTELY a drop in the bucket. Less than 1% of people are responsible for greater than 50% of emissions. A quick Google result leads me to a BBC article stating that just 100 fossil fuels producers are responsible for 70% of the emissions in the last 100 years. I don't feel like looking for any other sources tonight, but when I say the individual impact is a drop in the bucket, it's absolutely just a drop.
Don't let that undervalue it though. Each drop in the bucket buys us a bit longer to correct the gigantic ship that is corporations, and we'll need all the time we can get for that one. Keep doing what you can, but extend the empathy towards your fellows who are unable to do as much just yet. We all have a common enemy in this thing.