Will I see a little change by July 13?

I'm gonna start my diet and exercise tomorrow. I'l be eating healthy foods like vegetables, oatmeal, bananas, watermelons, oranges, yogurt, eggs,etc. I'll be workig out at least an hour a day. I'm 15, 5'2, 120 pounds. I usually eat junk food and I barely work out or move, lol. So doing this would definitely change my lifestyle, so I'm just wnmdering in two weeks how am I gonna feel and be like? I'm only gonna drink water to btw.