This feeling is always normal and is always experienced when it comes to relationships and friendship with the opposite sex.The main contributor to this feeling is low self esteem.
There's a time back in my life I experienced that to the extent that I would shy off whenever talking to a man.
Low self esteem makes you feel like someone is handsome and not your type or their life class is quite high than yours.You just feel like you're not worthy to be someone's friend or lover.
The only way to conquer this feeling is by having high self esteem. The only way you can do this is by, making yourself neat, being jovial always, talk to all people, share with someone how you feel like, engage yourself in activities among other things.