How do I climax from masturbating.........

HELP. So my boyfriend and I have a relatively new relationship, and I'm horny all the time... Like he is so God damn attractive to me, and we have AWESOME sex. When we have sex I climax on an average of 2 times. Every time. But we're both very busy, and we can't see each other that often, and like I said... I'm unbelievably horny. I've never masturbated, so I tried it, and I can't make myself climax. I don't know what to do to make myself cum, and it's so frustrating. When masturbating, I'm using a small dildo and rubbing my clit.... but am I doing it right??? LOL HELP