Hope do i cope with feeling left behind by my friends?

Im 21 and ive never had a guy have a crush on me, ive never held hands with a man, ive never been complimented by a man. All the crushes ive had throughout my life have all liked other girls. I have absolutely 0 experience whatsoever but im seeing my friends move in with their boyfriends and start getting married. Not one of my friends arent in a long term relationship. Theyve all moved in with boyfriends already. I don't know how to cope i guess i feel happy for them but i feel guilty for feeling so jealous.