The whole purpose of dating is find someone who 'fits' you -- your personality, your lifestyle, your values and beliefs. So, if you find yourself not able to 'be yourself' with the person you are dating, take a moment and ask yourself why you are investing the time in the relationship; it sounds decidedly one-sided. You should always feel free to be yourself. If your date cannot accept you for who you are, further dating can be more hurtful than helpful because, clearly, you two are not good for each other and probably not meant to be together.
When you date someone, there are bound to be a few little things that you'd like to change. Here are a few that you probably can't change (and that you probably don't want to live with your entire life):
a)is critical of your family
b)is critical of your friends
c)yells at you
d)blames you for all of relationship problems
e)avoids showing emotions
f)won't solve problems with you
g)doesn't like your family
h)doesn't like you spending time with your friends
j)wants you to do things that you aren't comfortable with
If you have observed one or two of these warning signs, think long and hard about continuing this relationship.