No you are not alone, procrastination eventually takes hold at some point in ones life.
A few tips that I will give include:
1. Get a piece of paper and remove the "mind-clutter" by mind mapping things that you would rather be doing or are yet to have done and put this aside. They will still be there later for you to deal with after your studying.
2. Breathe and reassure yourself. (Brings your focus back to the task at hand.)
3. Identify your aims and goals. -- What ATAR do you want? What sort of job do you want? ....
4. Reward yourself. If you have achieved and mastered a certain concept a break or reward can be good.
5. Avoid distractions and technology if possible. (Ultimately, you need a dedicated area that is quiet and one that you associate with study).
Some other suggestions that I have heard may work:
• Chose a time in the day you’re likely to be productive. For example, you might be a night person.
• Chose an appropriate place to work, for instance, find a quiet spot to read a chapter.
• Imagine your self doing the job easily and enjoying the experience.
• Use a semester planner to note when assessments are due. Set up a weekly schedule that includes time for study, work, friends and family etc. Write a daily list.
• Prioritise. Write a “to do” list.
• Break tasks into smaller chunks.
• Allocate time to task. Do you tend to underestimate or overestimate the time required?
• Get started just for five minutes and then decide whether to continue.
• Set a specific amount of time and see what you get done.
• Do small tasks when you think of them.
• You can tackle a task by doing the easiest part first or the one you like best to gain momentum.
• Focus your mind if you find yourself becoming distracted. You might be interested in learning more about mindfulness. Slow breathing techniques are also useful to calm your body and mind.
• Take short frequent breaks – go outside, get fresh air, listen to music for 10 minutes each hour.
• Swap tasks or change the type of activity you’re doing.
• Use your assertive communication skills to say no to distractions.
• Plan rewards, for example, “When I finish this report I’ll go to the movies with my friend.”
• Self monitor by checking in with yourself and recording what you’re achieved.
• Register for motivational e-mails.
Above all, as others have mentioned you still need to take time out to find the balance between the things you love and study! Once you find the balance between the two-- procrastination should slowly decrease.