I've seen a few of these so far and Jennie Rigg has tagged everyone who wants to be so I thought I'd have a crack myself...
I know things have been going quite well for you recently. You have just started at sixth-form college and have already made some good friends. However you will go through some difficulties over the next couple of years. Although it will be very hard, as you will find with all adversity it will ultimately make you a stronger and more resilient person.
Part of the fallout from this will be that you will think you don't want to go to university and instead will go and get a full-time job as a software engineer at the age of 17. Again, this is something you need to go through but rest assured you will go to university eventually and it will be one of the best things you ever do. You will meet people there who will still be some of your closest friends 19 years on (exactly as your mother and father predicted) and once you get a taste of independence there will be no going back!
On the subject of Mum and Dad, try to listen to them a bit more and be a bit fairer to them. They were right about education and only want what's best for you. In time they will become some of your closest confidants and they will support you unconditionally through thick and thin.
Try to spend as much time as you can with your grandparents. I'm sure you are mindful that they will not be around for ever but just try to bear this in mind when planning how to spend your time. They love the bones of you and at this stage in their lives they are largely living vicariously (look it up) through their children and grandchildren. This especially applies in a few years time when you will be living in Liverpool just a few miles away from them. You should make more of an effort at that point. It will not always be as easy to do so.
Don't worry too much about finding a girlfriend right now. There is a danger that you will get a bit obsessed with trying to find someone. Ironically, that will actually make it less likely to happen. You will have the odd girlfriend over the next few years (in some cases very odd!) but it will take time and more maturity from you before you are in a position to enter into a proper long-term relationship.
Try to get over your hangup about going to the Cinema, Theatre, music and comedy gigs etc. on your own. It will hold you back from doing what you really want to do unnecessarily.
Don't ever allow yourself to get bored. There is no need. There are a plethora of subjects to read up on and research. You already have interest in politics, comedy, Theatre/acting and various other areas. Join a library in every area you live in and make very good use of it.
Finally, try to stop worrying so much. You are on course to have a rich life with wonderful experiences and friends. You will be successful in a number of different areas. Try to channel that worry into more constructive things.
See you in 2009.
PS: In 1994, you will come across something called the "Internet" for the first time. You will initially be frustrated at how difficult it is to find things on it but won't give it too much thought. Try and solve it yourself! You will definitely have the skills to be able to at that point. You will have 4 years before anyone else does it and founds what becomes one of the biggest companies in the world....