To judge the severity of a phobia or social anxiety, look to the level of effort that goes into avoidance and weigh the cost of this avoidance. Are there missed job opportunities or other unfortunate results?
If you are overweight, lose it. Carrying extra weight can be stressful and cause low self-esteem. Talk to your doctor about how much you should reasonably weigh, and seek out a weight loss center or support group if you need the extra boost.