Any friends you make will only become grave resters eventually, and you must steel your heart against love because, for you, love is fleeting. Perhaps you'll never have a permanent home because you have to keep on moving from location to new location every few years before your neighbors get suspicious that there's something just not right about you. In sort, any kind of companionship from mortals will only last (from your perspective) an instant. Even if it's possible for you to surround yourself with immortal friends, there are only so many places to go and life-defying antics you can perform (and tropes you can browse) before life settles into a boring monotony.