Afraid to be me...

So I'm bisexual and I'm in a relationship with an amazing guy of three years. I love him more than anything and plan on having a future with him. He knows I'm bi and is very supportive. However with others I feel aren't as supportive... I did tell a few people and while most have been supportive, some have not especially my parents. They would say things like why would I be attracted to girls if I'm already in a relationship and that its wrong.. I grew up in a super religious household and have been struggling with my sexuality since I was 11 and finally came out about a year ago. Ive been feeling better about myself because of it but I'm still afraid to tell people because I'm afraid they will look at me differently especially my girl friends. I also feel like I shouldn't tell people because I'm in a relationship with a guy, so I feel like I'm not vaild. I feel really stupid for being so anxious about it but im just afraid of losing people I care about... Has anyone else gone through this?? I'm sorry if I don't make sense, I just needed to get my feelings out