So the other night I was masturbating(which I've done before) and I was trying to rub my clit which I think I eventually found and whatever I did definitely made me orgasm. It felt amazing. So my question is: were the other times I thought I orgasmed not orgasms since they didn't feel like the one I just had?
Orgasms can actually vary in how intense or good they feel. So, just because the orgasm you had last night felt really good doesn't mean that you haven't had an orgasm in the past. If you haven't already done so, check out this article that covers what orgasms generally involve and feel like: Sexual Response & Orgasm: A Users Guide.