I've lost 4 kilos in 2 months with MyFitnessPal, I really recommend it. I went from 68 to 64 kg, so a similar weight to you.
As others have said, it's the added sugar and the amount of food you're eating that's the problem, not the fruit. If you want to sweeten your overnight oats leave the honey out and use half a mashed banana. You haven't added measurements so it's hard to tell exactly how much you're eating, but it is a lot.
Breakfast: overnight oats with chia seeds, almond/cashew/coconut milk and some berries (plus 1 Tbsp honey or agave for sweetness) or smoothie (usually banana plus some frozen fruit and almond milk) with homemade granola (1/3 cup).
Smoothies are dreadful for you, they are basically sugar soup. Cut that out. It's fine as a treat, but not as a meal.
How much of oats do you have? For mine I do 20g oats, 1 teaspoon chia, 1 teaspoon flax seeds, 1 teaspoon protein powder, 100ml soya milk, 150ml water, half a mashed banana and 20g frozen berries.
On Sat/Sun I'd have some boiled or scrambled eggs, rye bread and avocado instead :D Love my eggs and avocado!
Snack: carrots and houmous (about 1 heaped Tbsp so it's not like I'm pigging out!) or cucumber and cottage cheese
No need to snack. Have an apple.
Lunch: usually a salad made at home: e.g. roasted sweet potato, spinach, tomatoes, avocado, some black beans, a bit of olive oil or I'll have a salad with brown rice, edamame, spinach, avocado and smoked salmon with a tamari dressing. That kind of stuff.
Looks good, but what is the size? Do you weigh your food?
Snack: greek yoghurt with berries and honey usually
Cut the honey.
Dinner: either some made turkey meatballs with tomato sauce and wholemeal pasta or turkey chilli with avocado and brown rice or some salmon and prawn curry with mange tout and courgette etc.
Snack (I am starving after exercising): sometimes greek yoghurt with berries, sometimes banana with peanut butter, sometimes apple.
Save your meal for after exercise and don't have a snack. 300 calories saved, just like that, with a bit of time management.