First I just want to point out a few similarities...I'm a senior, started here at my heaviest ever ~176 and have put on about 30 lbs since school started 3 years ago. Also, I'm a former band nerd (trumpet)

What I'm getting at is - if you ever want to talk to someone who is in a similar situation, feel free to message me.
NEMom has made a really good point about writing down what you eat. If you are honest and record every snack and every treat, you will quickly see where you are going wrong. I quickly realized I was overdoing it on treats and carbs and eating too few vegetables. If you don't know what the problem is, it's pretty hard to find the right solution! Once you see those patterns, you can start to change.
Also - you have the right attitude. You want a healthy change to last the rest of your life, not a crash diet. You are exercising. These are really good things that take some people a really long time to realize. Be patient, your efforts will be worth it.