Welcome to the forum.
It is often a feeling people get when first diagnosed but sometimes it is a relief as it can explain symptoms you have been having but equally people sometimes will have had no indication of an issue. However it is a very manageable condition and learning how to manage rather than control will depend very much on you and how you engage with changes that you need to make with your diet.
That very much depends on what your HbA1C is that has given your diagnosis and if you have been prescribed any medication at this stage and if you have weight to lose.
Have a look around the forum as there are a few recently diagnosed posting and they have had some responses with some ideas but also the Learning Zone (orange tab at the top) will guide you through some of the terminology and has some links that may help.
There are different approaches that people find suits them so finding the right way for you is important as otherwise it will not be sustainable.
Many find a low carbohydrate approach works for them, low carb being no more than 130g total carb not just sugar, but definitely not NO carb, this link may help with ideas for that way.
https://lowcarbfreshwell.co.uk/
Other people find a low calorie or shakes-based regime suits them.
Increasing exercise if you can will also help, brisk walking is good, it doesn't need to be the gym unless that is your thing.
Many find getting a home blood glucose monitor helps to keep a check progress day to day, week to week by testing in the morning, also testing the effect of meals on blood glucose to see how well you tolerate the carbohydrates you are having. You can also test if you feel unwell as it can indicate either high or low blood glucose. Monitors can be bought on line, the ones to look for are those with the cheapest strips. The GlucoNavii or Tee2 are ones people find reliable.