What do I need?

I'm really tired of being told about the things I need. Everyone is trying to give me a piece of advice by saying me: "Dear, you need to become more open-minded" or "Dear, you need a man to be happy". That's ridiculous! 

I've been dating with a guy for some period of time, but we broke up and it was very hard for me, so for now I need to stay with myself, but I really have absolutely no idea of how I can explain it to people who care about me. Sometimes I just want to stay alone, not to be picked on and not to explain the reasons of my being single or so serious about my life. 

Everyone, even my mum, likes to tell me that I'm too serious about many things. Of course I am! I have only one life and I just can't stop analyzing the experience I get. I like to be uncareful in many things I do, 'cause I know what it's worth to be careful about everything, such carefulness deprives you of possibility to live your life fully. Everyone makes his own choice, I've done mine for this life period, I  want to be on my own, I need to find my balance, to develop my thoughts and ideas. I can use this free time of not dating, not working, not fucking my brain, I can write (I always wanted to write!), I can draw, read, meet new people, spend time with my friends. I can stay in harmony with myself without any stress about a man or responsibility to other people. First of all, I'm  responsible  for myself, 'cause the only person to live my life is me. So, I shouldn't be told about too serious decisions or thoughts, believe me, I know the measure, I can combine everything!