Absolutely without meaning to, your friend could hold you back from finding your individual path in life. If they feel threatened within the friendship they could express their feelings of vulnerability in an inappropriate way. The funny thing is, by taking a strong, stubborn stand against change within the relationship, they might even end up pushing you away -- in effect, causing the very thing they'll be so afraid of.
So instead of fighting forward progress in your life, they should try to let you progress as the individual you are, at the pace and time that are right for you. You both deserve to make your most cherished dreams of a fulfilling future come true, and you shouldn't do each other the disservice of holding each other back from that journey.