my nippels are getiing big when i push them they hurt

I am assuming you are a male - your condition can best be described as Gynaecomastia - this is due to obesity and underlying hormonal imbalance. If it is serious, please visit a doctor for evaluation

is this something serious i am shy i dont want to tell anyone about this

Oh no, nothing serious. In most cases the situation resolves itself with time - that is obesity if controlled. ONLY in some cases it may require treatment.