Is this normal or not?
I don't think what you're describing is unusual. A lot of people for one reason or another become less active in their twenties than they were in their teens. Once people have jobs, cars, discover wine, eat out more and all the other paraphernalia of adult life the opportunities for doing serious amounts of exercise get squeezed and other pastimes look much more appealing
I think your first port of call is your diet.... Junk food and alcohol may be a temporary comfort but, in reality, they act as depressants and sap your energy. You're probably not diabetic but a poor diet can leave you short of vital nutrients.... and mild anaemia (iron deficiency) can result in lethargy, for example. So if you can improve your diet with less sugar, fried foods, refined starches & more fresh fruit and vegetables, wholegrain foods, lean meat/fish, more home-cooked food etc., the nutrional boost alone will make you feel more energetic and most probably happier at the same time. If you can ditch alcohol completely for a week or two and find other things to drink, that's also a good idea. When you feel energetic and happy then you'll also feel more motivated to get more active.
I wouldn't suggest you go straight back to intense track work from the off. Take it gently, starting with low-impact exercises and work your way up... Just a brisk walk every morning could be enough to get the ball rolling, for example.
It sounds like the normal result of going from being a very active calorie-burning machine to being a sedentary person... you're not going to stay looking and feeling as good as you did then unless you are prepared to do the work. As a normal-weighted person you might find that you start to look and feel a whole lot better just by tweaking your diet and eating healthy. Heavy on the fresh fruits and vegetables, and cut out the junk food!
I'm with kajikit. It appears to be just the result of abandoning (by accident or design) healthy eating and exercise and adopting habits that do not nurture your physical wellbeing.
I'm not sure what you mean by "could this be diabetes" - do you mean that makes you feel unmotivated to work out? Or are you having symptoms of diabetes? (excessive thirst, genuine fatigue, changing/diminishing eyesight, irritability) ... Does diabetes run in your family? (a strong indicator of your likelihood to develop it at some point.) Diabetes is a medical condition caused by inadequate insulin production by the pancreas. The only thing you listed above that might be an indicator is not "wanting" to get up and exercise, but that would really only be if you literally do not have the energy to do any physical activity. I'm no doctor, but I'm thinking "no" on diabetes as a cause ... but be careful, because diabetes can be an EFFECT of this lifestyle you're leading!
maybe running competitively isn't your "thing" anymore, but you definitely should find some type of exercise that suits you. your body is quite confused, I'm sure, wondering "what happened here???" you need to treat it right and give it something fun to do!

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