Those who love us demonstrate their love in ways that are meaningful to them. If you don't realize that, you may end up feeling unloved.
Some of the different ways people feel and express love are touch--like a hug; acts of service--like folding the laundry, putting gas in your car; gifts--like candy and flowers; words--like saying I love you, writing you a poem.
If you want to be effective in demonstrating your love it is a good idea to find out what is meaningful to the one you love, and vice versa.
Keep this in mind though: just because a person doesn't love you like you want them to love you doesn't mean they love you any less.
Here's the song "Only Way He Knew How" by High Valley, a Mennonite group. If you've got the time, take 4 minutes and listen to the words of the song. It may be just the reminder you need to realize how much you were loved, how much you are loved, by others.