You set the ground rules and boundaries of your relationship in the first few weeks and now you are changing them and your boyfriend is likely to feel insecure and threatened...
You sleep together and you like to cuddle him but you don't want him touching your breasts even though you have to know they are probably the best toys he ever had and it is (medically) good for breasts to be touched!
You might have issues about your body but if your boyfriend is OK with it why shouldn't you be - could be your body issues are just an excuse you are making to yourself to hide the fact you are, at heart, a bit of a control freak...
Few people are actually frigid - mostly what is perceived as frigidity is caused by something medical or emotional or by the chemistry between two people not being right.
OR it could be you haven't yet discovered what turns you on to sex - could be you have a quirk or fetish that when discovered will make you eager for lots of sex...
Meanwhile I advise you to protect your relationship with your boyfriend by honouring the relationship ground rules you helped establish and not to change anything without discussing it with him first and having a proper explanation ready for wanting change and be ready to meet him half way or compromise over any change he is not happy with - the adult thing to do!
A relationship should be a democracy and not an autocracy - even down to whether he gets to fondle your boobs after you have climbed into bed with him...
I strongly suggest if you want his continued respect and affection you first look at things from his point of view...
Most people discover, most of the time, it is nice to be nice and being nice can become habit-forming and having lots of sex makes more of the brain-chemicals that controls our sex drives!