Hang in there! I have thought a lot about this question too lately. How do you know if what you feel is love. How do you know if you are loveable. How do you recognize love when you are in the presence of it.
Where I've gotten with this so far.. (in case it helps) is it's almost like, if someone met all your needs, held up to every possible ideal, and you knew they would never leave you, would that be love? I think for many people it wouldn't. Because I think to really feel loved, you have to be able to feel vulnerable and accepted by the other person. There's a feeling of having each other's backs. For me it would also be hard to love someone without feeling they will be in it for the long haul. Which not all friends are... but some are.
Loving yourself is useful though to get through bad moments. I think that is a really great idea.
I have wanted to actually have this as a theme for a therapy session, just go in and be like "ok what is the meaning of love."