Don't give up, there are plenty people who turned around their health at your age.
What certainly will help you is to find a bunch of lower cal "snacks" to substitute for whatever causes your normal cravings.
Personally I managed best when alternating more lenient days with very harsh diet days. I.e half my normal daily intake with three quarters of my normal intake.
Also, increase your movement ever which way you can. For example a friend of mine started walking everything that was within three subway stations.
Do you have an estimate on what is your daily kcal need and what is your actual intake? Do you have a diet plan?
