palebird, It is very difficult to project what intercourse with a real live man will be like for you. Normally intercourse is hard work for a woman until you have figured out how you and your partner's bodies can work together.
Some general tips:
Your vagina does not have a lot of nerve endings inside. Most are around the outer third, so around the opening. It might take some extended stimulation before you feel anything inside. More women do not orgasm from vaginal penetration that do - so you are normal. A lot of woman do however feel the need to be 'filled up' deep inside their vaginas when they get close to orgasm. This is because your uterus lift up when you are aroused. This will cause your vagina to 'tent' at the top and create a feeling of wanting to be 'stuffed' up there. Having something in your vagina will also provide something for your pelvic floor muscles to squeeze on when you orgasm. This will often change the experience of orgasm for you.
Your main sexual response is based in your clitoris. This is what you are rubbing on your pillow. Your clitoris has no other function but to provide you with sexual pleasure. Rubbing it is thus the main way that most women achieve orgasm.
When you describe your orgasms as 'minuscule' I get the impression that you stop too early. You should continue until you get the big orgasm. You cannot harm yourself. Having these wave like sexual responses is normal and the pleasure should increase every time. You have to push yourself up the 'orgasm mountain' until you reach the very top before you can roll down to the very bottom again.
You will have to start to change the way you orgasm. Leave the pillow and blanket alone some times. flip onto your back and stimulate your clitoris and vulva with your hands and fingers. You might have to practice for a while to get there, so don't just give up. Try, try and try again until you succeed. If it does not work today, try again tomorrow, and the day after until you figured it out. Your neural pathways got used to the pillow and you now have to retrain them and create new pathways for this. Let the tension build in your genitals and concentrate on increasing the good feelings you are having. Don't stop too soon. Continue until you orgasm.
Take care!