I don't think anyone can tell another that they are a bad person. I think that every individual is doing as much as they can according to their current ability.
In my opinion, are you a bad person because you consume gelatine? NO. Do I think you should strive for zero consumption of gelatine? YES!
If I were in your shoes, I'll probably ask myself why gelatine is more okay to me than meat. If you want, I can provide many reasons for not eating gelatine, but since your current questions revolves around you being a bad person, I'd like to focus on that.
It sounds as though you're quite young too. Striving for as little cruelty as possible involves learning curve. I'm vegan so obviously I think gelatine is wrong to consume, but compassion toward each other is also important. You're probably doing what you can right now. Maybe you need more information? When I went vegan, I was upset because I could no longer buy silk shirts. I was angry and wanted my damn clothes
It wasn't until i looked up the silk industry, researched it, that I felt an emotional connection and found an inner motivation for avoiding silk. Maybe you need to read up on why gelatine is wrong to find your inner motivation?
Good luck. And don't let anybody tell you that you are bad or wrong. Just be the best you can be. And always improve on that.