Is it jealousy or it is the way it is?..

I work for a big company, I am still in the intermediate level, it has been 1 year since I am working my a** out to get promoted( still did not) and my twin sister works to a similar big company except that she is an expert level. She decided to get a job in my company. I just don’t feel like working with my sister in the same workplace I feel like it is a competition (only from my side) and I feel I won’t me be anymore around my colleagues… is it jealousy or normal?