I just changed job few months ago, everything seems alright in the beginning until recently. Im starting to feel the pressure as Im struggling to improve my self in terms of performance with the probation period nearing its end and what makes it worst is that my personal trait (too quite) is affecting my communication with my new colleagues as well. Not to mention that I have been rejected by girls and never ever been in relationship before.

Hey Mwolf99, just keep your chin up and focus on being the best version of yourself.
Why arent you performing at work? If its something you can change, do it immediately! Dont be lazy and find excuses!
As for girls, dont rush into a relationship. Girls will come to you when you enjoy your life. Focus on finding the joy of loving alone, be happy. Be that joy that others want a piece of as well! That's when you know you're a positive soul and others are also interested to learn from you as well.
If you dont love yourself first, how can you love others

Be positive! Take Care!