What you feel IMO is quite normal. I think AlmostAtheist hit it on the head: MOTIVATION and DIRECTION are what is needed. A lot of (ex)jdubs presume these things will be cast upon them/us if we "wait on Jah" - they are (or remain) in a constant waiting mode (for paradise to solve any problems). The fact that many of us have been brought up to think negatively about achievement, sports and college can contribute to a low self esteem. Lack of encouragement from our parent or peers and not being used to setting high standards for ourselves - often even distrusting our ambitions because they are equated with "materialism," can also be aggravating factors.
IMHO, unless you really want children, getting pregnant would indeed be the single worst thing to happen to you at this point in your life. I would think that what you need is a grand plan for the rest of your life to work towards. How would you like to picture yourself in five or ten years time? In theory you can achieve almost anything you want or desire - provided you design a plan that will get you there. The problem however is that this kind of satisfaction in real life stems from serious hard work.
For instance, you could go to COLLEGE and/or develop a specific skill that will make you money and will make you financially independent. This could give you a great deal of self respect. This will involve making a considerable investment in time, effort, money and perseverance in order to reach the stage where you can reap the benefits. But it will pay off in the long run. This can be very challenging and you need to make a definite commitment over the next couple of years.
You would be wise to involve others in this to help you along and encourage you. I bet a lot of us here on the board would be willing to show an interest in your progress and to encourage you along the way. Cut down on TV and internet and do more physical exercise or (group) sport. Set goals and make a schedule to fulfill them - In theory, you can do anything you wish... provided you are willing to invest serious HARD WORK.