I have been told that my calcium level is too high. is 11.2 high?

Yes: 11.2 level of calcium is high but not too high. Still need to find out why. Most common cause is taking calcium supplements. Other causes exist e.g. Conditions like hyperparathyroidism among others will be explored by your doc. High calcium need treated to prevent kidney weakness and stones.

Too high: 10.5 is upper limit of normal. A high calcium may not be bad but needs investigation. Check urine calcium to see if you do not excrete calcium, this is the most common cause and is benign. Avoid excess vitamin d and calcium supplementation. If urine calcium is high you need a workup. Common causes are excessive bone breakdown, sarcoidosis, cancer (you are young), excess vit d, tuberculosis.

High calcium level: You need to have the physician who told you your calcium (C) was high to do some blood tests to find out why it is. There are no good reasons for your C to be elevated. Some of the causes are hyperparathyroidism, high levels of Vitamin D, hyperthyroidism, sarcoidosis and metastatic liver disease, as well as others. Have your doctor do a work of your high C levels to get an answer and a treatment.