Overly jealous or depressed?

Me and my gf hace been dating for 4 years. I tell her she is beautiful everyday how much I love her need her and so on. The thing is she oogles celebrities and its gotten to me. I admit im jealous because ive been repeatedly cheated onby others but Is eating me up inside. I feel as though I can never match up to their perfect smiles look and bodies. Talked about it yesterday and I asked her ifbshe thought guys she saw on the street are cute as well she said no and evenbif she did she wouldnt act on it which is good. I said you sure because you hit on celebs. She said well no guy on the street looks like them... idk how to take that and it makes me mad. Am I overreacting?