Cant love or wont love?

I am finding myself thinking more and more about the "love" thing and wondering why I always end up in situations where I question myself. I have been told so many times I don't know how to love someone or I don't know how to show I love someone. Like how is there a book on the "how to love" chapter. I feel love inside my heart but I can so easily walk away and therefor people say I was never truly in love, and I feel like that's not true. I have been in love I have loved as hard as my heart and mind would allow me to. I think that could be what stops me from falling head over heals for a woman because I do think with my mind and not my heart. I have seen enough relationships go sour because the two people didn't think it out first. I always think about it no matter if I make the wrong choice at least I thought about it first and I am not going to allow someone to just hurt me. I can sow I am going through different emotions but I know that I have the ability to love my children and I do have the ability to love a woman I just make it so that I cant give my all to someone because that way if they don't do the same for me I wont be hurt. I can love, I can love, maybe I just chose not to...or if you know me...then you know I already did I just know how to fuck up before you do......well I am going to just continue to try to learn about love and what it means and what I am supposed to do with all this love shit because from my view I stand stronger because I didn't allow myself to fall yet maybe in the end...I will stand alone.