Why can't I lift as much?

At the beginning of the school year I was able to bench 95 pounds. I was able to do lawn mower pulls with a 100 pound dumb bell. And I was able to push with 35 pounds (not including the bar). About half way through the school year I started eating a lot healthier thinking I would actually be more healthy and able to lift more, right? I do feel a lot healthier, but I feel a lot weaker too. It is now difficult for me to do lawn mower pulls with a 50 pound dumb bell, I can only push with 10 pounds, and my max on bench is now 65. Why am I so much weaker now? At first I thought it was some sort of weird mind thing, but it’s not. That’s really all I can do. Is this because of my eating healthy? I didn’t eat hardly any junk food before, and now I eat very, very, very little to none. Any advice? I love you! (ps, I am actually eating food. I even eat in the mornings now and everything! So if you’re thinking that I’m anorexic or something, I’m not.)