There are benefits to your health for exercising, not only physical benefits but also mental benefits. Improving your physical health is a great way to improve your life.
Yes, many gyms will offer trial periods so you can try out their gym and understand what it's like to work out there.
With exercise persistence is key, it takes time for your body to adapt to your new exercise regime and it will take time before you see benefits from the exercise. Keep at it and try for at least a month.
If you find going to the gym boring and laborious you should try doing some group exercise classes, these classes can make exercising far more enjoyable and take your mind off the pain of working out!