26 and never had a boyfriend...why can't I fall in love?

I am a 26-year old female, and I'm at a point in my life where everything seems to be going great. Until now I travelled a lot, lived in several countries and had wonderful experiences with many different people which made me a very open-minded, understanding, easy-to-be-around person. I am now starting to "settle down", I have a very good responsible job which I love, I make good money, I have very good friends, etc. etc. One thing that concerns me even though I try not to let it bother me too much is that I've never had a boyfriend - and I'm going to be 27 this summer!! I used to be rather relaxed about this and kept thinking that the right one is out there for sure, so I never actually started LOOKING for someone, I just automatically assumed that one day we would find each other and then live happily ever after...;-)
It's not like I'm a very introvert, shy person, I don't have a problem getting to know people, I don't think I'm boring and I have a lot of interests. I do have very good friends, and most of my really close friends are actually male. I think my problem is that I don't fall in love very easily, for example it absolutelz NEVER happens to me that I see a good looking guy and think "Wow! I just HAVE to have him!".
The only time I fall in love is when I start feeling attracted to someone's inner beauty, and then it's too late because by that time we're close friends already and all I am to him is a "buddy" and at the same time by that time I am scared of telling him about my feelings because it might ruin our friendship. I've been in love twice in my life and both times that's how it was. I get to hear about his woman problems, he calls me when he met a new girl and tells me how great she is and how in love he is, I cover for him when he did something that she's not supposed to know about. I'm the only woman his girlfriends aren't worried or jealous about. He tells me he loves me and that he would never let one of his girlfriends come between us.
I feel like I'm SO ready for a relationship but for some reason my concept of having a great friend AND partner does have some minor flaws...
I would be really grateful if someone out there could give me some advice on how to fall in love. Tweet