I don't think that's unusual. The very first time I started measuring and tracking my food here, I was eating three or four times every day what I should have been eating. It's kind of how I got here in the first place, you know?
I would eat what you "normally" eat for a week or so. Record everything. Use accurate measurements, too - don't assume you know how much a cup is. One of the things I found out about myself is that the amount I thought was a cup was actually more like a pint!
After you know what you are eating, you can start to make changes gradually based on your eventual goals and health needs. Sometimes just exercising portion control but eating the same foods will be all someone needs to do. But the raw data of what you are actually eating will help you make those decisions.