Docs iam 18 years old and weight 70 kg and my entire legs are in pain all the time (no history in romatism but mom and dad are diabetic and have hbp)?

Need to be examined. Even with your family history and your weight, we do not know your bmi as you did not give your height. But the chances of you having hypertension and disbetese are much less but possible.But with constant pain in your leg you need to be checked to find the cause and start the appropriate treatment, we need detailed history., thorough physical exam, blood and urine test to find the cause and treat.