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I would strongly suggest that you start tracking your food. You can either do this by getting a notebook and noting down all the food you're eating, along with their calories, or use an app such as MyFitnessPal which can help make things easier. The app allows you to scan barcodes of products. Then all you need to do is fill in a few numbers and dropdown arrows and you're done.

I also agree with Sue in regards to cutting out foods such as sweets etc. Fast food is another to consider, as many contain little nutritional value.

If you're intending to have something sweet, try and replace it with some fruit. It'll still contain sugar but it's naturally occurring and also contains valuable vitamins and minerals that your body needs to keep going.

I would definitely seek help from a dietician as they're able to help prescribe a meal plan or diet that's based around your height, age, current weight etc; or at the very least, provide you with some more nutritional guidance.