So what do you do when you feel like your life sucks?

just let me know i go through this every few months everythings going great or at least normal like i feel as though i am spriitually and emotionally and pysically feeling great, and then the bomb drops. and it isnt lke an actual tihng its a feeling. like i feel lke ****, because i feel as though no one likes me and im just stupid and useless. i have a couple of problems with love aswell.... like i want to meet a great guy so badly but i just cant. i want the chemistry to be there i want everytihng but i just cant seem to find it i havent had my first kiss yet.. and i feel likea retard because everyone else has... btw. im 15. i dunno usually people get first kisses at like 13. some people who have alot going on in their life get it at around 16. but i have nothing going on in my life and i want it... just cant seem to get it. because i'll have a relatioship with a guy or start talkign to a guy... and then chicken out and feel like im scared because i havent had my frist kiss yet and they probab have had it. but anyways screw the second part of this question... i dunno why i told you guys but help me on the first part.... if you want you cant help me on the second aswell... your choice;... your descision