Having friend requests mean people literally INVITE you to be their friend. So they may not like you enough to want you to be their friend, or they're really lazy
Try finding people you like and just inviting them. If they really don't like you, the worst they can do is decline!
Groups are the same way, basically. What usually happens is a UG user who wants to joint he group posts a comment in that group asking to join. Then you'll most likely receive an invite.

Did I even answer your question?
Hope it helps...
Just keep posting. You're still a new user, and it takes some time before people get to know you.
Quote by Bob_Sacamano
i kinda wish we all had a penis and vagina instead of buttholes

i mean no offense to buttholes and poop or anything

Rest in Peace, Troy Davis and Trayvon Martin and Jordan Davis and Eric Garner and Mike Brown