I will surely try to explain it, based on what you told me here. I don't have a whole astrology chart in front of me, but you gave me an ascendant and some 11th house info, so that helps. There is a group of zodiac signs called "cardinal" signs. Aries, Cancer, and Capricorn are all cardinal, or leadership signs. So you are ambitious, and do want to express yourself. Cancer is a water sign, but even though they are reserved and can be quiet until you get to know them, they always end up getting attention. Just like Aries and Capricorn. I believe that both Cancer and Capricorn work that way, opposite signs often have similar traits. So you have the need to communicate, but it's hard for you to speak first, or to say things until you are more comfortable in the situation you are in. Also, both signs are very emotional, but don't show it on the outside. Are you holding in what you want to say too much? That can make you sick. Or do you feel shy at first, need someone else to break the ice? The Aries Sun is impulsive, but also a cardinal sign, so having the Sun there means you are an outgoing person. And I suspect there are certain people you can say anything to and be as assertive as you want. Capricorn Moon is a little fussy about who they hang around with, they can be social climbers, or take a wait and see attitude until they get more involved with others. So I think a lot of that sort of thing is going on with you. The Cancer Rising should make you seem approachable. Mars is physical, and in Taurus, it's gentle, but hardworking. The 11th house rules hopes and wishes, friends. So you probably meet new people through those you already know. That should help you to feel better at speaking to them. Plus if the Venus is close to Mars, also in Taurus, Venus is the love/social life planet. It is easy going, although you could wait for others to come to you first.
I think maybe you are your worst enemy. These are all assertive and outgoing signs. The Sun and Moon are stronger together than the Cancer rising, and Cancers are dramatic. Maybe it's the distance between your planets, called aspects, and I can't tell without a chart. I think you need to set your intention and reach out to others in small ways before they do to you. Then it will get easier. Shyness is usually overcome, I don't know how old you are. But that aside, once you do overcome this enough to realize you don't have to let shyness cripple you, you have a lot of leadership ability that could be very useful in a career, and I think with Mars in Taurus in the 11th house, you can be more talkative and communicate better as you do it more and more. I don't see anything wrong based on what's here.