In all honesty there is a difference between being 'needy' i.e. hanging on his arm 24/7 and wanting him to hold your hand to take you to the bathroom, never wanting him to leave your side and wanting a relationship i.e. phone calls (once maybe twice a day), texts, conversations, sex on a regular basis.
IMO it sounds like he is being a turd about this..... he doesn't want to call/text you, see you, initiate or take part in sex..... that would be a good sign that he is uninterested in the relationship going any further. I understand you 'love him' and may not want to be alone but
A) Love doesn't make up for a bad relationship (if he was abusive not just neglectful would you still stay? and yes he IS neglectful!)
B) You are young and have plenty of time to find a better guy.
C) If this was one of your girlfriends in this situation what advice would you give her?
If he really is 'the one for you' then he should treat you better. My advice would be to break up with him. If he is 'the one' then he will realize he can't live with out you blah blah blah, he loves you forever, you complete him, etc etc etc and will come back. If he doesn't then good riddance, see you later and find a guy that you will BOTH take better care of each other!
Also if you do this take some time for yourself before getting into another relationship. You're 19, lots of changes are going on with who you are, what you think is important and such. Figure out who you are before you expect someone else to figure out who you are and love you for it

GL hunn and I hope the best for you.