Hi there.. m 20 and me n my gf are planning to have sex..my problem ia that i have never masterbated earlier ,i just could not... so how long shall i last in bed... i have fingured her and licked her... and did not cum either due to excitment.. i only ejacuted in wet dreams..(10 times a month) ..so my questions are?

1.i am planning to take manforce 50 mg is it ok?

2.i cant retract my foreskin when erect... cam i have sex with condom?

3.how long shall i last?i have no experience apart from wet dreams...